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2017.20 Map Install on SD Card

Former Member over 9 years ago

Recently installed 2017.20 on my Nuvi 755T and, due to its size, it used the SD card for the first time. Garmin Express said it installed successfully. When I went to use it, it did not provide any directions to my destination. It simply said "Drive to 'XXXXX'" with the X's being the name of every destination I tried. The map would show my starting point with a perfectly straight magenta line that went straight to my destination. It did not follow any route. I thought that maybe the maps did not load successfully and I reloaded them. Same problem.

I then thought I would try taking the SD card out to see what happens. I shut down the GPS, took out the SD card and restarted it. Same problem. I checked the map info on the GPS and, even though the SD card was out of the unit, the map info said 2017.20. Did the unit get the map installed on it even though it was originally installed onto the card? Or is the unit just remembering the last map version installed and used?

Is there anything I can do to get my GPS to be usable again? Like I said, this was the first time the SD card was used. I did format it properly before inserting it into the unit.

I really needed it yesterday to travel from RI to NH and ended up having to print out MapQuest directions and read those while driving. What a PITA that is. It is amazing how easily we get dependent of technology!

0 SUSSAMB over 9 years ago

Remove the sd card, and remove gmapsupp.img (save it somewhere safe on your PC) from your device:

Now look in Settings, Map and Vehicles, myMaps ... what is now listed?

0 alandb over 9 years ago

5335

On the old 755T, it is under Tools > Settings > Map > Map Info.

0 SUSSAMB over 9 years ago

Ah thanks, forgot he had an older device!

0 Former Member over 9 years ago

Remove the sd card, and remove gmapsupp.img (save it somewhere safe on your PC) from your device:

Now look in Settings, Map and Vehicles, myMaps ... what is now listed?

What I have showing in the Nuvi internal without the SD Card inserted is:
CN North America NT 2017.20
(1) Lower 49 States

CN North America NT 2017.20 3D
(1) - US & Canada'

When I turn it off, insert the SD card and then go back to Map Info, it says:

CN North America NT 2017.20
(1) All
(2) Lower 49 States

CN North America NT 2017.20 3D
(1) - US & Canada

If I understand everything now, if I were to take the SD card out for any reason, I still have a full set of functioning maps for the Lower 49 States. With it in, I have a complete set that includes all of North America. Correct?

0 SUSSAMB over 9 years ago

Looks like it. Just a word of caution, ensure you only select one map as having two covering the same area can produce weird routing results.

0 Former Member over 9 years ago

Looks like it. Just a word of caution, ensure you only select one map as having two covering the same area can produce weird routing results.

And is that achieved by a checkmark for just one set of maps in Map Info?

When I select just:
CN North America NT 2017.20
(1) All
(2) Lower 49 States
The map and vehicle position appears normal.

When I select just:CN North America NT 2017.20 3D
(1) - US & Canada
The map and vehicle position appears odd, placing my vehicle away from it's actual location.

With both selected:
It looks correct, but you say both could be a problem?

0 SUSSAMB over 9 years ago

Apologies. Thought you could select either of the two 2017.20 maps. The 3d map should remain selected.

As you have two sources for the 2017.20 map I'm not sure whether or not you'll have issues. It may be the most sensible course is to remove the lower 49 map, but alanb may be able to offer a different insight as I never owned an early model nuvi.

0 alandb over 9 years ago

If this was my 755T, I would probably delete all the currently installed CN NA maps, start with a clean (freshly formatted) SD card, and allow Garmin Express to reinstall the full CN NA map. Garmin Express should give you the option to use the SD card when it sees there is insufficient space for the full map. If you decide to try this, don't hesitate to PM me if you would like more detailed information on how to proceed. In any case, make a complete backup of both your device and SD card before you start deleting the old maps. And do not delete the base map (gmapbmap.img) or the time zone map (gmaptz.img)

0 Former Member over 9 years ago

If this was my 755T, I would probably delete all the currently installed CN NA maps, start with a clean (freshly formatted) SD card, and allow Garmin Express to reinstall the full CN NA map. Garmin Express should give you the option to use the SD card when it sees there is insufficient space for the full map. If you decide to try this, don't hesitate to PM me if you would like more detailed information on how to proceed. In any case, make a complete backup of both your device and SD card before you start deleting the old maps. And do not delete the base map (gmapbmap.img) or the time zone map (gmaptz.img)

Yeah, I want as clean an install as possible. I took out the card and formatted it. I went into the Garmin and it still has maps showing as:

CN North America NT 2017.20
(1) Lower 49 States

and
CN North America NT 2017.20 3D
(1) - US & Canada

Which files would they be here in the latest screen shot?

0 EXPRESSCUSTOMERCARE over 9 years ago

RalphTomaccio

I am sorry you are having trouble updating your nuvi 755T. If you want to do a clean installation, please remove the "gmapprom.img" file (this is the "Lower 49 States") and remove the "gmap3D.img" file (this is the 3D map of "US and Canada"). Make sure you "Empty the Trash" or else the data is still on the device.

Reinstalling the current maps now should leave the device with only the current maps. Let us know if you have trouble.

Dave