I have Nuvi 1690 and recently downloaded Topo24K_West to 8 GB on my GPS. I can turn on and off the maps (topo and regular) via Nuvi 1690's tools, setting, map, info – check or uncheck option. However when I run MapSource or BaseCamp to get map from the device to add waypoints, routes, etc, it says the unknown device (memory card) does not have any maps installed. Files showing up in the map folder on the memory card are topo24K_west.img and topo24K_west.unl. What is required to transfer to BaseCamp map to and from that memory card?
Thanks for any advice.
Dean