I've got a magellan sportrak that's a couple of years old and works great, BUT I would like one with more zoom. I think, don't have it in front of me, that the smallest scale on it is 100' screen size. When I mark several times in a smallish area, it's hard to discern individual targets. Does anyone know of a handheld that has a smaller scale available? I've done some research but the scale sizes aren't readily available on spec tables.