Note that this problem is also present in the newer nuvi 7x5 unit software v3.10 and -seems- to be related (but as yet unverified) to ecoRoute.
I've found a problem with nuvi 7x5 unit software v3.0 and traffic data using the GTM 20 traffic receiver. I am not receiving traffic data for traffic incidents closer than approx. 6.0-7.0 miles away with the 765 using v3.0.
I have two different GTM 20 receivers, both with lifetime traffic subscriptions. I plug both my 765 and my 760 into each cradle/receiver at the same point in time in the car in my driveway. The 760 picks up incidents 0.3 mile away (ongoing construction on a nearby freeway). The 765 does not and only picks up the nearest incident ~6.0 miles away. I swap the units on the cradles/receivers with the same result...the 765 does not pick up the nearby traffic incidents while the 760 does.
Now I -backdate- the 765's unit software from v3.0 down to v2.5. The unit now performs exactly like the 760 does, picking up all the same nearby incidents at 0.3 mile away.
Now I upgrade the 765's unit software back up to v3.0 and the problem returns, no traffic incidents any closer than 6.0-7.0 miles away
Just a heads-up for those who are getting strange traffic data. I am staying at v2.5 for now since v3.0 now has this bug along with the other WebUpdater/USB/SD Card bug.
This issue has also been reported to Garmin. If you're seeing this issue with 765 v3.0, I urge you to contact Garmin and report it. You can contact them directly at firstname.lastname@example.org.
Does back dating cure any other problems, like slow map redraws or the occasional rebooting of the unit? How do I take my 785 back to the v2.5?
1. Get your desired firmware version region file here:
These are the only versions available as of 2/13/2009
Version 2.20 that came pre-installed on the earlier first units is not publicly available.
2. Rename the file you downloaded to GUPDATE.GCD
3. Copy the file to the x:/Garmin folder on the nuvi drive
4. Safely disconnect the nuvi from USB and let the unit reboot.
5. If you're backdating, follow the "Are you sure you want to flash an older version to the unit?" prompt.
Here's a tip if you're doing extensive testing of different firmware versions and are updating or backdating frequently:
Keep a copy of each version you'll likely be testing in the x:/Garmin folder (assuming you have the space on the nuvi drive) but rename each version to something like:
The numbered extension identifies the firmware version. When you want to flash a certain version, just rename the file to remove the .xxx numerical extension to GUPDATE.GCD and that version will be flashed on the next nuvi power cycle. You do have to remember to rename the file & put the numerical extension back on to identify the firmware version though. This also lets you update/backdate when you're offline so you don't have to download/re-download the files every time. You do however need access to a PC to do the filename changing.
As far as slow map redraws, I can't say if it will fix those issues since I have not really noticed them on my unit. I have heard though that the slow map redraw issue -seems- to be related to the 2009.11 maps.
If you backdate firmware to 2.50, do you lose MSN3?
Yes, you'll lose MSN3 if you backdate to v2.50. MSN3 was added in firmware v3.00...v2.50 did not have MSN 3 in the code. Here's the 7x5 changelog:
Thanks for your reply back. I use GDB50 so looks like I am not affected by this bug.
Just an additional note to be sure and backup your favorites in case the update/backdate wipes them out.
Backing them up:
Copy the file x:/Garmin/GPX/Current.gpx to another drive on your system
Rename your favorites backup from Current.gpx to Temp.gpx and copy that file back to the x:/Garmin/GPX folder. On the next power cycle, they will be imported back into your GPS.
Invaluable information. Thanks so much. Actually I got it from your other posts on other forums. I have noticed slow map redraw while driving on highway. I have noticed that top part of map will go blank and then map will redraw again. But it happens only on highway. May be because of the speed of the vehicle, it can not keep up.
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