Good night
I have a 276C, but i think the update process is similar for the 376C.
First of all, you need to update your 376C to the latest firmware available; you can find the firmware update on Garmin site; download it and then execute the file, following the instructions; the unit must be conected by USB to your PC.
After this operation, your 376C is ready to receive recent NT maps, using Mapsource; you need this software to compile the maps and send them directly to your unit.
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