My Garmin 2797 offers you the choice of
- Top is North
- Rotating in Direction of Travel ( and this is the one that I use 99% of the time.
Top is North does not help you in upcoming turns when you want to see what the road looks like.
the 7 inch display is a terrific asset for me, I can view how the road ahead is going to effect how I drive, or if on a bike, how twisty that next turn is going to be.
that is why on my Bike, the 2797 is mounted dead center, just below the dash.
However, 2 years ago, when traveling on my bike through Georgia and Alabama on a darkened sky day with it raining all the time, I had to stop and put the GPS in Top is North.... I got so confused as to which way I was going, it almost made me sick.... no sunlight to fix my internal compass
an old country store, with Plowshares sitting in the floor is where I stopped and got my bearings.... a sandwich, chocolate milk, and a cooky..... then the GPS got reprogrammed so that I could actually tell that "yes, you are "for the most part, actually going Northwest, and now Southeast"... funny thing about that country store. I asked the girl at the counter " which way is North?" I got the funniest look from her, and she said I just follow the road.
following riverbanks can really get you turned around.