Have multiple GPSs. I keep one on the boat or in the tackle box. I got Garmin Lakes and want to keep an SD card in the boat GPS and have one in the truck GPS so I don't have to remember which GPS I have to have in the boat or truck.
What is the best method for unlocking the SD card so I can make a spare SD card to put in the boat GPS.
Unlock the map image with gimgunlock and you can put it on multiple microSD or SD cards which will work in any device with a card slot. The following path is universally recognised by all such units, whether automotive, outdoor or marine: sd:/Garmin/gmapsupp.img.