Hello. I need help continuing to use my BlueChart G3 map on GPSMAP devices. I have the original locked map on a memory card (which consists of: a gmapsupp file, a gmapsupp.gma file, a gmapsupp.unl file, and three img files). What I want to know is how to continue using the locked map on another GPS because inside the .unl file there are eight lines of code, each 25 characters long. If anyone can help me, please.

Quick answer is:

- if it is Original card, and u switch to newer device, which supports Bluechart G3 , new device will read card acknowledge it and everything is fine.
.UNL file will receive additional line in it for new device ID key generated by software and thats it.
Just u will not get updates if card is older than 1 year, if it is less than 1 year you will receive updates as usual.