Each time I attempt to download a topo map to my gps 60csx it erases whatever is on the memory card. I north america 2008 on and it was removed after downloading ny topo. I am loading with the memory card in the unit. How can i download the other topos without losing what is on the 2g memoey card
That's normal. You have to send both to your datcard at the same time. Please do not add maps to a pre programmed Garmin datacard. Instructions are here:
http://www.gpsfiledepot.com/tutorials/how-to-load-maps-on-my-garmin-gps-unit/
Thanks for the help