1. Yes, the main reason I use a GPS, I record all my trails. Most units you can set how often/far it records a breadcrumb based on time or distance. I usually get a day and a bit out of a pair of AA batteries (~8hr days, Garmin Oregon). Pairing to my phone so people can get live updates of where I am really sucks the battery juice though of both phone and GPS (only on some models and only works if you have phone reception anyway).
2. No.
3. Depends on the brand of GPS. I find Garmin Mapsource easier to use than Basecamp. Uploading waypoints is a simple click of the button, even if you are manually entering spots its easiest to do it on the computer then upload to the GPS.
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