how do i add maps to gpsmap c60 please
Do you mean the GPSMap 60c? http://gpsinformation.us/gps60c/g60review.html
That old device was designed to work with Garmin's Mapsource software. Do you have Mapsource installed on your computer? See this tutorial for how to load maps with Mapsource: https://www.gpsfiledepot.com/tutorials/how-to-load-maps-on-my-garmin-gps-unit/#mapsource
Basecamp is Garmin's newer software, Mapsource has been discontinued. If you don't already have Mapsource on your computer, you can download Basecamp here.
https://www8.garmin.com/support/download_details.jsp?id=4435
Then see this tutorial: https://www.gpsfiledepot.com/tutorials/how-to-load-maps-on-my-garmin-gps-unit/#pcbasecamp
hiya yes 60c i have great Britain topo one it Will not open in base camp ? help please
I don't see any map at GPSFileDepot named "Great Britain Topo". Exactly what map are you talking about? Is it this one perhaps? https://www.gpsfiledepot.com/maps/view/762/
If so, that map is not hosted at GPSFileDepot and it is not free. You should contact the author through his website if you have questions. http://www.the-thorns.org.uk/mapping/help/ukgarmin.html