Tunnel Mode - Please add your model if it offers Tunnel Mode

 

Based on this thread:

http://www.poi-factory.com/node/48312

it seems time to create a list of Garmin GPS devices that offer Tunnel Mode.

What is Tunnel Mode? Here's an example (the left-hand device in the video):

https://www.youtube.com/watch?v=8CZZx4iAQv4

Early reports of this feature occurred as long ago as February 2010 but it may have only been offered in a small number of tunnels as Garmin tested the feature.

If your Garmin has Tunnel Mode and hasn't appeared in this thread yet, please respond with your model number. Once we have a good list, I can create a FAQ since I haven't found this information anywhere else on Garmin's site or through Google.

As we understand it, Tunnel Mode does two things:

-when entering a tunnel between sunrise and sunset with the device set to auto-dim after sunset, the display switches from day mode to night mode; and
-when entering a tunnel, your vehicle is shown driving through the tunnel at a constant speed which is your speed as you entered the tunnel.
-it may also be that when in Tunnel Mode, the device's Loss of Signal message may be disabled, at least for an expected time period inside the tunnel.

In the list, I assume that models that have been shown to switch to night mode entering a tunnel also show the vehicle progressing through the tunnel at its speed as it entered the tunnel. If this assumption is wrong, some models may need to be removed from the list if they only auto-dim.

Thanks.

The current tentative list:

nuvi 255
nuvi 660
nuvi 775T
nuvi 1350
nuvi 1450
nuvi 2360
nuvi 2460
nuvi 2465(TW) [Made for use in and sold in Taiwan]
nuvi 2557
nuvi 2595
nuvi 2689
nuvi 2699
nuvi 3590
nuvi 3597
DriveSmart 50, 60 and 61
DriveAssist 50
DriveLuxe 50
RV 760

List of models unaware of tunnels:

nuvi 750
nuvi 855
nuvi 1390

Page 1>>

No tunnels in IA

No tunnels in Iowa so I can't be of much help on this project, but I was wondering if simulation mode tells us anything on models that have tunnel mode. For example, do they still change from daytime to nighttime display when simulating driving through a tunnel?

EDIT: I just simulated driving through the Lincoln Tunnel on my 3597. It does indeed shift from daytime to night time lighting when entering the tunnel and back to daytime lighting when exiting. So this may be a way to test different models (as long as you test during the daylight hours of course.)

--
Alan - Android Auto, DriveLuxe 50LMTHD, Nuvi 3597LMTHD, Oregon 550T, Nuvi 855, Nuvi 755T, Lowrance Endura Sierra

Well ...

... my DriveSmart 50 has it.

--
Where there's a will ... there's a way ... DriveSmart50LMT-D, Nuvi 2508LMT-D, 1490LMT, 1310, Montana 650T, Etrex 20

2360/(2465TW)

2465(TW)/2360 has it.

Thanks

Pillowcase wrote:

2465(TW)/2360 has it.

Is TW an Asian map model?

3597

I have a concern about the definition of "tunnel mode". I go through a tunnel everyday with my 3597 and I cannot confirm that the speed remains the same through the tunnel at a constant level. Through the tunnel, the speed was changing with my own speed (slowing down). I can repeat the test over the next few days.

The model does auto switch day to night mode in the tunnel though.

The

2557 also has this "tunnel mode". And it does switch from daytime to nighttime illumination when in the tunnel.

--
(2) Nuvi 1450LMT + 3597LMTHD + 2557LMT Boston MA

I wonder...

Narvick wrote:

I have a concern about the definition of "tunnel mode". I go through a tunnel everyday with my 3597 and I cannot confirm that the speed remains the same through the tunnel at a constant level. Through the tunnel, the speed was changing with my own speed (slowing down). I can repeat the test over the next few days...

I wonder if this could be due to some tunnels having a GPS signal being relayed into the tunnel. I've read internet reports supporting and denying this but I do feel that I may have been in a Phoenix AZ tunnel that offered such a feature.

Can anyone shed some light (in the darkness) about GPS repeaters or whatever is used to allow GPS signals reach into normally-signal-poor areas like this?

Repeater

Narvick wrote:

I have a concern about the definition of "tunnel mode". I go through a tunnel everyday with my 3597 and I cannot confirm that the speed remains the same through the tunnel at a constant level. Through the tunnel, the speed was changing with my own speed (slowing down). I can repeat the test over the next few days.

The model does auto switch day to night mode in the tunnel though.

Your tunnel may not be long enough to block the signal. Or, Waze has begun putting some repeaters of sorts in tunnels, and you could be picking that up.

--
Frank Nuvi 3597LMT 37.322760, -79.511267

No Such Thing as 'GPS Repeaters'

CraigW wrote:

I wonder if this could be due to some tunnels having a GPS signal being relayed into the tunnel. I've read internet reports supporting and denying this but I do feel that I may have been in a Phoenix AZ tunnel that offered such a feature.

Can anyone shed some light (in the darkness) about GPS repeaters or whatever is used to allow GPS signals reach into normally-signal-poor areas like this?

No such thing as 'GPS repeaters'. GPS operates off line-of-sight (LOS) radio signal transmissions from satellites in view. How GPS works:

https://www.gps.gov/multimedia/poster/poster-web.pdf

FYI.

Then again...

tli wrote:

No such thing as 'GPS repeaters'. GPS operates off line-of-sight (LOS) radio signal transmissions from satellites in view. How GPS works:

https://www.gps.gov/multimedia/poster/poster-web.pdf

FYI.

Then again, read:

http://www.terrisgps.com/how-do-gps-repeaters-work/

It does seem to me that these repeaters can keep a GPS device linked to satellites in a tunnel but I don't see how they can monitor movement in a tunnel for example. It seems that the external antenna of the repeater would be the only lat/long/elev it could send to tunnel devices. That's why I'm confused as to their purpose with regard to tunnels.

So-Called 'GPS Repeaters' Prevent Satellite Signal Loss Only...

There's a misunderstanding of the intended applications and purposes of these so-called 'GPS Repeaters.' That article's 'GPS repeaters' are not intended for GPS receivers to provide precise user position while satellites signals are blocked--like inside a building or tunnel. Just not possible and not how the GPS system was designed to work. These 'GPS repeaters' only receive the GPS satellite signals which are then rebroadcasted passively inside buildings or tunnels where there's no line-of-sight with the GPS satellites. The sole purpose of this is to allow the GPS receivers uninterrupted tracking of the GPS satellites' status and position as they orbit overhead with different satellites shifting in and out of view. As the article states, a couple of key points:

"The use of re-transmitted signals means that the GPS receiver is tracking the current GPS status, so that when the receiver is moved from indoors to outdoors, the receiver is instantly tracking the location, instead of taking several minutes on the acquisition of the current GPS state."

"It should be noted that all the repeaters in a single network will transmit the coordinates of the outdoor antenna"

Let me try to explain the operation of these 'GPS Repeaters' along the discussions of this thread's tunnel scenario... If such a 'GPS repeater' is in service here, an active outdoor GPS antenna would sit outside on top of the tunnel connected via a coaxial cable to a repeater unit with a built-in passive antenna inside the tunnel. This setup would allow the Garmin GPS receiver units to never lose sync, or loss of signal reception, with the GPS satellites while inside the tunnel, however long. Even as the GPS unit is moving through the tunnel, the displayed position will remain stationary with just the location of the outside antenna. As soon as the Garmin unit exits the tunnel, the unit would then be able to readily provide an accurate position, without having to spend time re-acquiring the satellites. That's the whole intend and purpose of these so-callled 'GPS Repeaters.'

Garmin? Garmin?

I would like to read about this Tunnel Mode, but there is NOTHING about it on the Garmin website.

Could someone please post a real link to it?

Thanks.

--
GPSMAP64s, iPhone 6 w/Garmin North America, Yaesu VX-8R w/GPS.

Tunnels.. same as underground parking lots

Tunnel experience is much like what one sees when in an underground parkade.. It shows the vehicle moving until the pre-loaded map and presumed direction / speed runs out.. then goes to lost satellite.

I think...

--
Lives in Edmonton AB A volunteer driver for Drive Happiness.ca and uses a 2689 to find my way.

?

tli wrote:

There's a misunderstanding of the intended applications and purposes of these so-called 'GPS Repeaters...

As I said, I didn't think the GPS repeaters would give a vehicle location in a tunnel but rather maintain a signal. Aren't you just agreeing with me and the article in the link I included?

Admittedly, the use of these in ships on the ocean make more sense than putting them in tunnels since, on a moving ship, both the maintenance of signal and location are useful while in a tunnel, only the signal continuity is of value. It does bring into question whether any or many tunnels go to the effort of adding one, especially since GPS devices can quickly reacquire a signal after a brief loss.

It has been pretty universally assumed in discussions here and elsewhere that Garmin's Tunnel Mode uses dead reckoning to determine a vehicle's "location" in a tunnel, with or without a GPS signal, and that tunnel locations are built into map updates so the tunnel-mode-compatible devices know when to kick in dead reckoning.

Navigon for Android

supports "Tunnel Mode". Not sure about whether is switches to nightime mode while in the tunnel.

GPS Repeaters Couldn't Provide Position Info, Thus Speed...

I was confused too, and initially misunderstood the intended purpose of these repeaters. Since Nanrvick claimed to have observed that his displayed speed was matching his actual speed while going through the tunnel, and you'd suggested that possibly could be provided via GPS signals being rebroadcasted with these GPS repeaters. In order for the determination/estimation of speed, the GPS receiver needs position awareness which these GPS Repeaters could not provide. Phranc's suggestion of Waze repeaters could be a possibility if Nanrvick was using Waze. I think it might be a Bluetooth connection with Nanrvick's cell phone that's providing location info while inside the tunnel for the GPS receiver to be able to determine his speed via cell node transmitters.

Tunnel Mode

Add DriveSmart 60 LMT. I went to a tunnel in Ca and did a simulation.

3597 Observations

I drive up to Atlantic City every few months. The route I take is up the Eastern Shore of VA/MD.

To get to the Eastern Shore from where I live requires me to use 3 tunnels. The Hampton Roads tunnel and the 2 tunnels on the Bay Bridge Tunnel are the ones I use.

Whatever speed I enter a tunnel at, is the speed that my 3597 maintains while in the tunnel.

There have been instances where I entered at one speed and while in the tunnel have had to slow down because of a claustrophobic driver going well below the speed limit. Before I exit the tunnel, I will get a "Lost satellite reception" message.

In the instances where I entered at a speed below the speed limit and then traffic picks up speed while in the tunnel, the 3597 will "snap" the vehicle icon out of the tunnel as soon as I leave it and the 3597 gets satellite lock.

During light traffic when I maintain a constant speed, using Cruise Control, the vehicle icon shows leaving the tunnel at the same time that I actually do exit.

I think that my Nuvi 660 acted the same way, but I haven't used it in a long time.

--
Metricman Nuvi 660, GTM-20 Traffic Receiver Nuvi 3597 GTM-60 Traffic Receiver Williamsburg, VA

2465(TW) Taiwan Model

CraigW wrote:
Pillowcase wrote:

2465(TW)/2360 has it.

Is TW an Asian map model?

Yes. 2465 (discontinued) is one of the models sold exclusively for Taiwan. Singapore and Malaysia has the same model but had slightly different customization. These models have user interfaces and features different from the equivalent US/EU/Astralia models.

The 2465(TW) or (SG/MY) models were somewhat equivalent to the US 2360 model.

2465(TW)
http://www.garmin.com.tw/products/discontinued/nuvi2465T/

Google Translated
https://translate.google.com/translate?sl=auto&tl=en&js=y&pr...

2465(Singapore/Malaysia)
http://www.garmin.com.sg/products/discontinued/nuvi_2465_sg_...

US 2360
https://buy.garmin.com/en-US/US/p/87150

Driveluxe 50LMTHD

Craig, I don't know if observing the shift from day to night and back to day modes in simulation mode is sufficient evidence of support for tunnel mode, but if you think it is, the DriveLuxe 50LMTHD seems to have the tunnel mode feature.

--
Alan - Android Auto, DriveLuxe 50LMTHD, Nuvi 3597LMTHD, Oregon 550T, Nuvi 855, Nuvi 755T, Lowrance Endura Sierra

I'll add it

alandb wrote:

Craig, I don't know if observing the shift from day to night and back to day modes in simulation mode is sufficient evidence of support for tunnel mode, but if you think it is, the DriveLuxe 50LMTHD seems to have the tunnel mode feature.

I'll add it for now since I expect the Luxe would offer it and more importantly, for the day/night to work, the device must know it's in a tunnel and adding the "maintain the speed in tunnel" is something I'd expect when day/night is active.

Older and Essential models needed

I hope we can get results for some of the older models and maybe determine a date when the first models offered TM. Also useful would be to see if the "plain Jane" Essential models like the nuvi 50/60 and Drive 50/60 offer TM. For these, if TM is not present, let us know.

Are you sure the DriveLuxe50

Are you sure the DriveLuxe50 has tunnel mode? I was using a DriveLuxe51 while traveling in Europe, where I went through a lot of tunnels. I don't remember seeing tunnel mode on the DriveLuxe 51.

Just my two cents.

--
Garmin DriveLuxe 51 LTM-S

3590 LMT

3590 LMT confirmed.

755T - NO

CraigW wrote:

I hope we can get results for some of the older models and maybe determine a date when the first models offered TM. Also useful would be to see if the "plain Jane" Essential models like the nuvi 50/60 and Drive 50/60 offer TM. For these, if TM is not present, let us know.

I can tell you that my 755T (2008 model) does not switch daylight modes when simulating through the Lincoln tunnel. I didn't expect it to, but at least it is some indication that observing the daylight mode change in simulation was not a "feature" of these old models without tunnel mode. I think it adds some credibility to using simulation to find out if tunnel mode is supported in a specific model.

--
Alan - Android Auto, DriveLuxe 50LMTHD, Nuvi 3597LMTHD, Oregon 550T, Nuvi 855, Nuvi 755T, Lowrance Endura Sierra

Thanks

alandb wrote:
CraigW wrote:

I hope we can get results for some of the older models and maybe determine a date when the first models offered TM. Also useful would be to see if the "plain Jane" Essential models like the nuvi 50/60 and Drive 50/60 offer TM. For these, if TM is not present, let us know.

I can tell you that my 755T (2008 model) does not switch daylight modes when simulating through the Lincoln tunnel. I didn't expect it to, but at least it is some indication that observing the daylight mode change in simulation was not a "feature" of these old models without tunnel mode. I think it adds some credibility to using simulation to find out if tunnel mode is supported in a specific model.

Thanks. I guess I should follow my advice and check out my 855 and 2460. Ha, maybe I need to print out your FAQ on release dates and as we progress, see if there's a clear cutoff point. On the other hand, I can imagine that the Essential Series devices, even the new ones, may not offer TM and that could muddy the waters.

Good point

helloguys wrote:

Are you sure the DriveLuxe50 has tunnel mode? I was using a DriveLuxe51 while traveling in Europe, where I went through a lot of tunnels. I don't remember seeing tunnel mode on the DriveLuxe 51.

Just my two cents.

This is worthy of investigating. If the 50 has it, the 51 certainly should. Then too, maybe all or some of Europe doesn't have the necessary info built into the map to activate TM. We have heard that it works on some models in the UK. With my luck, right after turning this into a FAQ, Garmin will come out with a FAQ describing its features and the models and maps with TM rolleyes

I'm pretty sure my 2460 does

I'm pretty sure my 2460 does it, but I know my 2689 does.

In fact the first time it did it was odd to me and I posted about it here with a video of it happening. I can't seem to find it now.

In that node there was a comment about the "tunnel" being listed on the "here.com" maps that Garmin was using. At the time I was traveling through 3 such tunnels each day, sometime many times, while at work. The day to night mode switch on worked on one of them. They all were around the same length, but short compared to your example Craig.

--
. Nuvi 2689, two Nuvi 2460, Zumo 550, Zumo 450, Uniden R3 radar detector with GPS built in, includes RLC info. Uconnect 430N, Garmin, built into my Jeep. .

Both

Both my 3597 and DriveLuxe 50 have it and works every time I drive through the Deck Park Tunnel in Phoenix AZ. That tunnel is 2887 ft. in length.

--
Nuvi 350, 760, 1695LM, 3790LMT, 2460LMT, 3597LMTHD, DriveLuxe 50LMTHD and TomTom XXL540s, HereWeGo for Android.

Garmin had it in 2011

Here is a Boston Globe article from July 2011 showing that Garmin had this feature at that time: http://archive.boston.com/news/local/articles/2011/07/07/how...

And I may be wrong about my 755T. I found this old Feb. 2010 discussion over on the GPS Review forum (and I even participated in the discussion!) indicating that even the old nuvi 255 continued tracking through a tunnel, If the 255 did it, I expect my 755 from the same generation does it as well. There goes my theory that the day/night lighting in simulation mode identifies models that have the feature ... back to the drawing board.

I normally don't link to other forums, but hopefully JM won't mind an exception here since we are doing historical research. Here is the thread: http://forums.gpsreview.net/discussion/18080/how-did-the-gar...

--
Alan - Android Auto, DriveLuxe 50LMTHD, Nuvi 3597LMTHD, Oregon 550T, Nuvi 855, Nuvi 755T, Lowrance Endura Sierra

@ soberbyker

--
Nüvi 255WT with nüMaps Lifetime North America born on 602117815 / Nüvi 3597LMTHD born on 805972514 / I love Friday’s except when I’m on holidays ~ canuk

in addition ...

CraigW wrote:

I hope we can get results for some of the older models and maybe determine a date when the first models offered TM. Also useful would be to see if the "plain Jane" Essential models like the nuvi 50/60 and Drive 50/60 offer TM. For these, if TM is not present, let us know.

In addition to what I wrote above, (the edit button is gone) I know neither of my units started out with it, it started happening after a map update which is why I noticed it. I have my GPS on the entire time I am at work, like a rolling map, even though I don't need it to be. My job takes me up and down a highway a tunnel sometimes 10 times a day. One time I kind of noticed it switch from day-night-day but wasn't sure, next time through I taped it, sure enough that's what it did. Hadn't been doing that prior to an updated map set.

--
. Nuvi 2689, two Nuvi 2460, Zumo 550, Zumo 450, Uniden R3 radar detector with GPS built in, includes RLC info. Uconnect 430N, Garmin, built into my Jeep. .

I remembered what I called

I remembered what I called the node "2460 anomaly" here's the node (video in first post):

http://www.poi-factory.com/node/42199

From 2014, you even have a few comments Craig.

ETA: Thanks canuk, as I was putting together the post and looking the old post you already found it.

--
. Nuvi 2689, two Nuvi 2460, Zumo 550, Zumo 450, Uniden R3 radar detector with GPS built in, includes RLC info. Uconnect 430N, Garmin, built into my Jeep. .

Interesting

alandb wrote:

Here is a Boston Globe article from July 2011 showing that Garmin had this feature at that time: http://archive.boston.com/news/local/articles/2011/07/07/how...

And I may be wrong about my 755T. I found this old Feb. 2010 discussion over on the GPS Review forum (and I even participated in the discussion!) indicating that even the old nuvi 255 continued tracking through a tunnel, If the 255 did it, I expect my 755 from the same generation does it as well. There goes my theory that the day/night lighting in simulation mode identifies models that have the feature ... back to the drawing board.

I normally don't link to other forums, but hopefully JM won't mind an exception here since we are doing historical research. Here is the thread: http://forums.gpsreview.net/discussion/18080/how-did-the-garmin-do-this

The Boston article was interesting. And the 2nd link seemed familiar as I came across it last week doing a search. From this 2nd link, it appears that I can add the nuvi 255, 1350 and 775T.

The link did mention that some 255 users saw TM working while others didn't. Given that the link started in Feb 2010(!), I wonder if part of the problem was that Garmin (or Here or its predecessor) may have just started to add encoding to the map updates for tunnels and that back then only a few tunnels had the encoding to alert the GPS devices that they were in a tunnel...sort of similar to the school zone speed limit changes first reported by rame1012 that occurred for just a few schools in Louisiana years before Garmin started to advertise school zone alerts for newer models. Hmm, if some tunnels still aren't encoded for Tunnel Mode even now, that could confuse our determinations of which GPS models can display it.

Given now that we're seeing reports of TM as far back as 2010, I wonder if it'd be easier to create a list of the ancient models that don't offer it. I may test my nuvi 750 and 855 and see what they show in a simulation.

Great thread!

The thread has several good links: the Youtube, a Garmin firmware update FAQ, etc.

.

CraigW wrote:

The thread has several good links: the Youtube, a Garmin firmware update FAQ, etc.

Hummm, I wonder if I am on ignore sad

--
. Nuvi 2689, two Nuvi 2460, Zumo 550, Zumo 450, Uniden R3 radar detector with GPS built in, includes RLC info. Uconnect 430N, Garmin, built into my Jeep. .

nuvi 2595 has it

I go through a tunnel in NC on I-40 fairly regularly. It isn't long, but enough to lose signal.

No never

soberbyker wrote:
CraigW wrote:

The thread has several good links: the Youtube, a Garmin firmware update FAQ, etc.

Hummm, I wonder if I am on ignore sad

No never! We both simultaneously started replying to canuk's message and only after I posted my reply did I see yours!

.

CraigW wrote:
soberbyker wrote:
CraigW wrote:

The thread has several good links: the Youtube, a Garmin firmware update FAQ, etc.

Hummm, I wonder if I am on ignore sad

No never! We both simultaneously started replying to canuk's message and only after I posted my reply did I see yours!

Ahh, but I made few references to it during the thread, oh well, I knew from the minute I read the title i had written about it in the past.

--
. Nuvi 2689, two Nuvi 2460, Zumo 550, Zumo 450, Uniden R3 radar detector with GPS built in, includes RLC info. Uconnect 430N, Garmin, built into my Jeep. .

not on my 3597

Driving in Southern California or Colorado, it doesn't seem track my actual speed or it looses signal if too long in the tunnel.

Older devices

Experiment:

With all devices using map 2019.10, I tested a nuvi 750, 855 and 3597. I started a bit west of the Eisenhower Tunnel in Colorado on I-70 and simulated a route to the east. I don't know if a simulated route is a valid way to test vehicle movement in a tunnel since when simulating a route, the devices can't experience the loss of signal inside the tunnel and switch to dead reckoning mode as would be experienced in a realtime drive of the route. I selected that tunnel for its long length and because I've driven through it with a 3597 and seen the Tunnel Mode features display inside the tunnel.

Neither the 750 or 855 could recognize the existence of the tunnel and therefore there was no dimming of either display. Both did show the change in speed limit from 65 before and after the tunnel to 50 near and being in the tunnel but that's an expected speed limit issue unrelated to Tunnel Mode.

The 3597 on the simulated route identified the tunnel as it approached the tunnel by showing a bit dimmer roadway. When entering the tunnel, the display switched to night mode and continued at the simulated 50 mph.

Conclusion:

There are older Garmin GPS models that can't pick up the tunnel information built into the map and therefore can't do any Tunnel Mode features. The 3597 worked as expected with TM features working although I still am not sure a simulated route is a way to test loss of signal and vehicle movement in the tunnel as only a realtime drive can present the device with loss of signal with a switch to dead reckoning inside the tunnel. If actually true that the nuvi 255 and 755 can do Tunnel mode as others have reported, that rules out date-of-model-release as a valid indicator of a model's ability to do Tunnel Mode as the 255 and 755 (with TM?) were released between the release dates of the 750 and 855 (no TM). It would be great to have someone confirm or deny the TM abilities of the 2x5 and 7x5 series.

I'm charging my old nuvi 2460 and will duplicate the above experiment tomorrow after sunrise and report back.

2460 video

CraigW wrote:

~snip~

I'm charging my old nuvi 2460 and will duplicate the above experiment tomorrow after sunrise and report back.

In the node I had started a few years ago, the one canuk (and I) referenced above I took a video of my 2460 in real time making the change (https://www.youtube.com/watch?v=PpqcArXTkVk) around the 40 second mark of the video you'll see me go into the tunnel, which really isn't much of a tunnel, just a longer than average underpass, and you'll see the 2460 go into night mode, than return to day mode as I exit.

(39.943276, -75.142818)<--- for your simulation, this is the spot.

Odd, also in the video, I go into another, but shorter, tunnel and there is no change. The video is on I-95 in Philadelphia, PA. I was traveling northbound in the video, the one works and other does not on the southbound side as well.

Also, there is another long overpass, around the same length where it works on 95, on I-676 not far from this one and it does not switch day/night in real time.

One more note, I now use a Nuvi 2689 and it works exactly the same in both areas I mentioned here.

--
. Nuvi 2689, two Nuvi 2460, Zumo 550, Zumo 450, Uniden R3 radar detector with GPS built in, includes RLC info. Uconnect 430N, Garmin, built into my Jeep. .

Thanks

soberbyker wrote:
CraigW wrote:

~snip~

I'm charging my old nuvi 2460 and will duplicate the above experiment tomorrow after sunrise and report back.

In the node I had started a few years ago,...
One more note, I now use a Nuvi 2689 and it works exactly the same in both areas I mentioned here.

Thanks, I'll add the 2689 to the list. I did watch the 2460 YouTube but my worry was that a 9-10 second tunnel may be on the short side for monitoring speed changes although it certainly confirms that model is tunnel-aware and does auto-dim. The 2014 posting date is remarkable as it's on the early side of tunnel features for Garmin devices demonstrated through a video.

.

CraigW wrote:

~snip~

The 2014 posting date is remarkable as it's on the early side of tunnel features for Garmin devices demonstrated through a video.

Just a note you may have missed, the 2460 didn't always do it, it was after an update, the date I posted was 3-7-14 so whatever Garmin update had come out around that time was when it first appeared, I mention in my original node "2014.40 map update".

I can also confirm the speed does get weird on any tunnel I've gone through. In the video it's hard to see but I went into the tunnel at 51 mph, where it stayed through the tunnel and when the GPS changed back to daylight mode the speed jumped up to 55 mph. There are many underpasses around here, including a double decker bridge where when on the lower level the speeds jumps all over until coming out from under it. I also have photo's somewhere of the breadcrumbs line jumping all over as well.

--
. Nuvi 2689, two Nuvi 2460, Zumo 550, Zumo 450, Uniden R3 radar detector with GPS built in, includes RLC info. Uconnect 430N, Garmin, built into my Jeep. .

Thanks, everyone!

Thanks for all the help with data gathering early in this search to learn about models with Tunnel Mode.

The current list could use more data and more confirmations on the older, "plain Jane" and specialty models like those listed below:

Essential Series (nuvi 3x, 4x, 5x)
Older nuvis (2x0, 2x5, 1xxx)
Drive (5x, 6x)
Specialty (zumo, dezl, RV, nuvicam)

Also, when reporting your findings, it might be useful to include whether they were gathered through a realtime drive or a simulation as well as if you see 1) switch to night mode and 2) vehicle "tracking" inside the tunnel including if the in-tunnel speed is the speed at which you were traveling as you entered the tunnel.

Thanks in advance.

We were posting at the same

We were posting at the same time again Craig, (prior to your edit) see my post just above yours.

--
. Nuvi 2689, two Nuvi 2460, Zumo 550, Zumo 450, Uniden R3 radar detector with GPS built in, includes RLC info. Uconnect 430N, Garmin, built into my Jeep. .

I looked at video But it

I looked at video But it did not make any sense as to what it was trying to explain....

Lots tunnels on Blue Ridge Parkway, That I've been through with 660 and 2689LMT.... but I don't recall either doing anything unusual....

What are we talking about????

--
A 2689LMT in both our cars that we love... and a Nuvi 660 with Lifetime Maps that we have had literally forever.... And a 2011 Ford Escape with Nav System that is totally ignored!

My Nuvi 350 doesn't...

CraigW wrote:

I hope we can get results for some of the older models and maybe determine a date when the first models offered TM. Also useful would be to see if the "plain Jane" Essential models like the nuvi 50/60 and Drive 50/60 offer TM. For these, if TM is not present, let us know.

...support tunnel mode. The 350 came out in 2006 and retailed at about $350.00. At the time, it was the top of the line model as I recall.

--
It is impossible to rightly govern a nation without God and the Bible. ----George Washington

Second Test

phranc wrote:
Narvick wrote:

I have a concern about the definition of "tunnel mode". I go through a tunnel everyday with my 3597 and I cannot confirm that the speed remains the same through the tunnel at a constant level. Through the tunnel, the speed was changing with my own speed (slowing down). I can repeat the test over the next few days.

The model does auto switch day to night mode in the tunnel though.

Your tunnel may not be long enough to block the signal. Or, Waze has begun putting some repeaters of sorts in tunnels, and you could be picking that up.

On a second test, this time the 3597 maintained the same speed as I entered the tunnel even as I slowed down significantly in the tunnel. I must have been getting some sort of signal going the other way the first time.

Not sure

if my 2598 has it. Only time I've driven through a longer tunnel I lost satellite reception and that's all I remember seeing on the screen at the time (a few years ago).

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