I have a Gpsmap 923xsv and have previously downloaded a new purchased map region with success. Now, I am adding another map with the Garmin Express and all seems to be fine (the download process etc), except the plotter does not see any map on the sd card when inserted. Neither if the card is there at startup or if inserted when the device is on. It works fine with another card that has the other map, so the problem seems to be this specific map. I have tried several SD cards (even the one that works with the other map) with no success.
What can go wrong with this specific map, and is there any way I can check the validity of the map on the SD card?
Regards,
Rune