Q1) all right I bit the bullet and bought a micro sd card for garmin. I got the old set of maps on the garmin machine and a newer set on the micro card (both for north America)
Will garmin default to the newer mapset if I got the micro sd card with newer map plugged in, and default to older map in machine if micro card isn't plugged in automatically?
Q2) on micro sd card I got the gmap3d.img for Europe maps, can I rename this to Europe3d.img if I wanted to to match Europe.img map I got in there, or it doesn't really matter?