Originally Posted by khuon
Good enough to get approved in many cases for the 200' decision height on precision approaches... It depends on the unit. The Garmin, Magellan, Lowrange and Morrows are pretty accurate.
I use the Garmin GPS-12 when I am looking for elevation measurments. I also use it to map out routes and to insure my bike computer is "near" accurate.
EDIT: The only function it does not do that I would like is to record the elevation changes with the route. Or even total elevation gains/losses etc...