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Please connect your Nuvi up to a PC and look to see if you have the map file "gmapprom.img" in the Garmin directory. The file should be around 1.5 to 2 GB in size. If the file is missing you will need to replace it. If you have registered your unit with Garmin, you may be able to log into your Garmin account and download the map file again. If you can't, then you will need to send the unit to have the map file restored by a service shop. More info on missing maps can be found here:
Question: What should I do if my Garmin nuvi or zumo displays the message "No Detailed Maps Found That Support Routing" or "No Map Data Available?"
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Answer:
The "No Detailed Maps Found That Support Routing" or "No Map Data Available" message may appear on your device for the following reasons:
The GPS device is missing it's unlock code
The maps on the GPS device have been disabled
To determine the cause of the message, touch the screen until the message "No Detailed Maps Found That Support Routing" disappears.
If you see a "Can't Unlock Maps" message following this error, remove any microSD / SD cards in the device and follow the instructions below for Retrieving your unlock codes followed by the instructions for Creating an unlock file
If you do not get the Can't Unlock Maps message then skip to the instructions for Enabling maps on the GPS device
If you got the unit from somebody they could of used a SD card and its looking for it and the ynever switched back to the regular map... to check try this..
Settings ... Map.... on he bottom of screen you will see Map Info .. press it.... it should now say what map is loaded on the gps...
It should have a checkmark in the City Navigator North American NT, if not put one there
Contact Garmins Tech support hot Line they will walk you through the process and if they can't fix it over the phone they will send you a disk that will completely fix the "NO detailed maps found that support routing" I have contacted them with the same problem and the disc was free of charge.
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