I have the GPSMap 76. Had it for years. What I like about it is a nice large display and it uses AA batteries. IMHO, the edge is way too small to be useful. Even the GPSMap is a bit on the smalll side and it is huge by comparison.

You might be better off with a cell phone or tablet. But then you need to worry about charging.

Believe it or not, I just got a smart phone. On the next tour I might try using it as a hotspot for the tablet. and use Google maps on the tablet.