I've just tried to update my nuvi 3597 with the new maps 2014.20 but garmin express stops and gives me three option:
1)free up some space (recommended)
2) use microsd card
3) select a region
I have an sd inside my garmin but i'm not sure which option to pick (1 or 2).
And with the first one, what kind of files will garmin express delete?