Being a cheap-skate, I bought a second-hand Magellan. If I'm flying from A to B, all the GPS will tell me is that I have to turn right or left a bit, I've still got X miles to got, I'm doing Y ground speed & I'll get there in Z minutes.
It won't tell me where I am, which is great because it means I have to look outside and at the map. All it will do it to make sure that I am on track, following the line on the map.