Just purchased a 78sc. I would like to use it on the roads of North America and Canada. What is the best thing to buy for this. Should I get a download? A CD, or a micro SD? im a newb to this unit and have never installed/downloaded or purchased maps before so please bear that in mind. I would lean toward a lifetime subscription for updating purposes but not opposed to one time purchase. Also what is the size limit on micro sd for this device...thanks
