dead reckoning

 

Why is it the Garmin does have dead reckoning in the Nuvi line? There is a premium paid for this units and you would think it would be included. Or is it that most GPS units don't have this anymore? I think it would be a welcomed addition to any GPS. What do you think?

Not Sure???

iceman2k4 wrote:

Why is it the Garmin does have dead reckoning in the Nuvi line? There is a premium paid for this units and you would think it would be included. Or is it that most GPS units don't have this anymore? I think it would be a welcomed addition to any GPS. What do you think?

Not sure what you are asking, but what Premium are you talking about? There isn't a Premium paid for the NUVI line.

Why...??

iceman2k4 wrote:

I think it would be a welcomed addition to any GPS.

What could 17th century "technology" possibly give you that a standard GPS can not??

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Magellan Maestro 4250// MIO C310X

there really is no point in

there really is no point in dead reckoning. id rather know when i have an accurate signal. in NYC you can lose your signal in between tall buildings, and alot of traffic, i would hate for the gps to start getting a few turns ahead of me.

Re: Dead Reckoning

I assume you are talking about the GPSr 'guesstimating' its position when there is no or weak satellite reception (i.e. when in a tunnel or surrounded by tall buildings), correct?

Krieger

Dead Reckoning

Dead reckoning would let the GPS make a "best guess" effort if it lost communication with the satellites. Could be useful in a parking garage, long tunnel, heavy forest...anywhere there isn't a clear view of the sky.

And dead reckoning isn't so 17th century. It's pretty heavily used by the military in all sorts of ways. Try fixing your position in a submarine running several hundred feet below the surface.

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ɐ‾nsǝɹ Just one click away from the end of the Internet

My DeLorme & Laptop had dead reckoning

Dead Reckoning just assumes that you will continue at your current speed and heading when the signal is lost. My laptop and DeLorme had that. It was moderately useful at times, since the receiver that it had in 2004 wasn't all that sensitive and was more prone to signal loss.

It was moderately useful as long as the road I was on was fairly straight and my speed was fairly continuous. This is not when you really need it because you don't tend to lose signal in that situation.

Most users would be totally freaked out if they lost signal and then stopped at a traffic light or gas station or something and they saw their GPS happily continuing on it's journey down the road. These newer chipsets are so sensitive and we lose signal so infrequently that it's just not a feature that would be usefull very often.

i would assume losing a

i would assume losing a signal in a parking garage you would be ok, and i also assume when entering a tunnel you come out the other side.

Yup - that's how it worked

The tunnel scenario was actually useful for monitoring the progress in a long tunnel. Not so useful in terms of not missing any turns or getting lost somewhere between the entrance and exit. wink

The parking garage scenario is totally useless unless you enter, park and exit in a straight line. And of course it would have no idea of WHEN you actually stopped and parked. And when you did, the GPS would continue and show you coming out the other side.

Dead Reckoning would be VERY useful to a ship on the ocean because there would be no landmarks to tell you where you were otherwise. A guess would be better than nothing. In a car, well, you just look out the window. grin

They use to put in their GPSr's then they striped them down.

a_user wrote:

Dead reckoning would let the GPS make a "best guess" effort if it lost communication with the satellites. Could be useful in a parking garage, long tunnel, heavy forest...anywhere there isn't a clear view of the sky.

And dead reckoning isn't so 17th century. It's pretty heavily used by the military in all sorts of ways. Try fixing your position in a submarine running several hundred feet below the surface.

Correct, plus It's not usually a available feature since Garmin started to produce and strip down the Nuvi model line.
Earlier Streetpilots had it.

--
Using Android Based GPS.The above post and my sig reflects my own opinions, expressed for the purpose of informing or inspiring, not commanding. Naturally, you are free to reject or embrace whatever you read.

HEY!

a_user wrote:

Try fixing your position in a submarine running several hundred feet below the surface.

HEY.....I resemble that remark! smile

--
COWBOY CREED -- If it ain't right, don't do it....If it ain't true, don't say it....If it ain't yours, don't take it.

I wouldn't mind just a north

I wouldn't mind just a north arrow on my 260 map screen. Seems basic enough.

that is a great idea,

that is a great idea, especially for people like myself with a pretty good sence of direction, and know highways, interstates direction, north, south, east west bound, it just helps have a feel where you are, and where your going, not major important, but wouldnt hurt if it was an available option, i would use it.

allthough you can use north

allthough you can use north up map, which i tired and dont like, i actually like, and perfer the 3D view. i would even rather the bird eye view rather than north up, north up is only good for planning, i dont think while driving its a good idea, unless of course some people are used to that.

Need to define the term

johnc wrote:

Dead Reckoning just assumes that you will continue at your current speed and heading when the signal is lost.

If that is how you are defining the term, how do you know that many/most GPSr's don't really have that now. I would assume that all of the newer ones do, at least to some extent.

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Magellan Maestro 4250// MIO C310X

Unless Garmin has false information regarding its features..

ka1167 wrote:
johnc wrote:

Dead Reckoning just assumes that you will continue at your current speed and heading when the signal is lost.

If that is how you are defining the term, how do you know that many/most GPSr's don't really have that now. I would assume that all of the newer ones do, at least to some extent.

None of the nuvi line has dead recokning, and dead reckoning is the process of estimating one's current position based upon a previously determined position, or fix, and advancing that position based upon known speed, elapsed time, and course. rolleyes

--
It is terrible to speak well and be wrong. -Sophocles snɥɔnıɥdoɐ aka ʎɹɐƃ

Garmin states the nuvi line

Garmin states the nuvi line does NOT have dead Reckoning, i believe tomtoms do.

an alternative if you really must have dead reckoning. is if you are in an area with no satalite signal, you can turn gps off, and simulate the route.

dead reckoning

True dead reckoning, in my understanding, requires a direct connection to the vehicle's computer to get speed and direction information to provide positioning. The Nuvi line will sometimes hold at the speed it lost reception (ie entering a tunnel) for a small amount of time. There doesn't seem to be any logic as to how long it lasts, and eventually it will give the "lost satellite reception" alert.

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Garmin Quest/Quest2/Nuvi660/Nuvi755T

i think the sometimes hold

i think the sometimes hold at the speed might be actually a weak signal. not all tunnels have no signal, the midtown tunnel i get reception in one tube, but lose reception in the other tube in the opposite direction. i forget which direction is which. the same is true for my friend who also has a 760

also tomtom has dead

also tomtom has dead reckoning, and as far as i know there is no connection to the cars CPU.
that sounds like a great idea, as a back up to signal loss, connect to a compass, and speedometer for direction and distance traveled.

I believe i read an article here about the first GPS in a Honda in the 80 worked like that, it was a paper map with a magnet, and you had to pick your start point, and it worked like a gyrometer ( i think i made that word up)

yes there is

Yes we do pay a premium. When a new Nuvi comes to market they are almost always more expensive that comparable units from other vendors.

Yes that is what I'm talking

Yes that is what I'm talking about. It would be great if the Nuvi line had this in my opinion.

Nuvi's are a premium unit,

Nuvi's are a premium unit, with a premium price, how ever i do not think dead reckoning is considered a premium option. all though point is in a premium unit you would liek the option to be available.

but with everything extra features can mean more money, bigger size, later release date, less available memory, slower, and other side affects, when making a product the company must decide the line to take, premium, luxary, economy, fully loaded, practical.

im sure there can be a fully loaded every option under the sun, feature in the world, but it might be too big, too expensive, to compromise the product.

I know this sounds like 1 tiny feature, but with millions of customers, im sure we all have our one tiny simple, easy feature in our mind, but the line has to be drawn.

Im sure no one was offended, or bought a tomtom over a garmin because of dead reckoning. im sure thats not a decision breaker, with all the other things as processor speed, map accuracy, best routability, price

speed hold

scott81nyc wrote:

i think the sometimes hold at the speed might be actually a weak signal. not all tunnels have no signal, the midtown tunnel i get reception in one tube, but lose reception in the other tube in the opposite direction. i forget which direction is which. the same is true for my friend who also has a 760

I have experimented in the past going through the big dig tunnels in Boston. Coming to a dead stop in traffic, the GPS shows me still moving at the speed it lost a signal at for about 20 seconds or so. Nothing like it showing you are going 45mph when in fact you aren't moving at all.

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Garmin Quest/Quest2/Nuvi660/Nuvi755T

i would have to agree, i

i would have to agree, i remember one time that definitely happening to me

Inertial Navigation

craig470 wrote:

True dead reckoning, in my understanding, requires a direct connection to the vehicle's computer to get speed and direction information to provide positioning.

I believe that is called Inertial Navigation.

Your right! always more expensive that comparable units

iceman2k4 wrote:

Yes we do pay a premium. When a new Nuvi comes to market they are almost always more expensive that comparable units from other vendors.

The key to what you said was "we do pay a premium."
But you still just get a Nuvi.

Down boys, I have one too.

--
Using Android Based GPS.The above post and my sig reflects my own opinions, expressed for the purpose of informing or inspiring, not commanding. Naturally, you are free to reject or embrace whatever you read.

i would say that, u do get

i would say that, u do get what you pay for. im happy with the quality and use of my 760. based on this site garmin board more popular about 5000 to 1000 than the tomtom board, and i get the feeling most of the people on the garmin board paid more than tomtom, but did so on their own terms and happy with their purchase. that is untill the whole 7xx series firmware fiasco.

Because.....

iceman2k4 wrote:

Why is it the Garmin does have dead reckoning in the Nuvi line?

The definition of Dead Reckoning: (per Wiki)

Dead reckoning (DR) is the process of estimating one's current position based upon a previously determined position, or fix, and advancing that position based upon known speed, elapsed time, and course.

So, as someone else stated, (and I tried to but did poorly), that can't be included without some other, external input of speed and course.
Or else what you want really isn't dead reckoning at all.

Making a wild assumption based on a position, speed and direction from some time in the past certainly is NOT dead reckoning; it would be more like "wild guessing". mrgreen

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Magellan Maestro 4250// MIO C310X

.

In other threads on this subject, I have said that it is my opinion that the units are "faking it" as they go through the tunnels or other areas like this.

Exactly

Motorcycle Mama wrote:

In other threads on this subject, I have said that it is my opinion that the units are "faking it" as they go through the tunnels or other areas like this.

Which is quite different than "dead reckoning" which implies something fairly accurate.

I'm not sure we really know what the original poster was wanting when he used that term. but I'm guessing that it IS the "faking it" function which most recent units already HAVE.

They wouldn't list "dead reckoning" as a feature because that is NOT what it is. They might not list "faking it", assuming a continuation for a short signal loss, either since they don't necessarily list EVERY little thing that the units do......or don't do, as the case may be.

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Magellan Maestro 4250// MIO C310X

A little quote would be helpful

iceman2k4 wrote:

Yes that is what I'm talking about. It would be great if the Nuvi line had this in my opinion.

What exactly is the "that" you are talking about ??
Which post was it ? mrgreen

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Magellan Maestro 4250// MIO C310X

Don't think this would matter either way

I don't think this would matter either way. Just like the other post said, if you go in a tunnel or parking garage, eventually you come out. I suppose the down side is if you try to mark where your car is parked, but the 'dead reckoning' puts you in the wrong place.

.

ka1167 wrote:

Which is quite different than "dead reckoning" which implies something fairly accurate.
... snip ...but I'm guessing that it IS the "faking it" function which most recent units already HAVE. ... snip ... They wouldn't list "dead reckoning" as a feature because that is NOT what it is. ... snip

Absolutely. I agree 100%.

"dead reckoning"

You learn something every day.
My thinking of "dead reckoning" was moving between point a to point b without roads or routes, like the hand held legend models.
C