Simple GPS that runs on replaceable batteries. Use it when I walk for days on end. 401: An survive about 20 hours on a set of AAA batteries in the forested terrain.
Use it primarily to:
-Have Track of how far I have taken and how many meters of altitude I have
-Which Height, I am in when it's fog
-Skoj To check on how I went in retrospect
To keep track of where I am doing, I particularly with upright map.
Got rust inside the battery compartment for a little rainy hike. Sent it to Outdoor expert who sent it to the Garmin. Got a brand new one. So great customer support from Garmin.