Boethius

This is going to seem dumb - but which way is the right way to hold the Colorado? Flat, parallel to the ground, or pointing up. or does it matter? I read somewhere that which way depends on the type of receiver or something I can't really find any more. Thanks, Steve C.

I have the top and the NA street map on the core unit. there is lots of room for what I need, which is half of southern Ontario. if you want to dump the whole thing onto the device, you will likely need to use the SD

Pretty much - that is my understanding anyway.