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GPS Shopping Guide

The Standard: Most hikers want their GPS units to collect geographical breadcrumbs as they hike, save key points of interest (POIs) at the push of a button, guide them to a designated spot, and let them follow a route they’ve previously recorded or loaded. These features are now fairly ubiquitous, but a few other options useful to backpackers aren’t. The ideal unit also interacts with your computer (for uploading/downloading information); has a big screen (at least 2.5 inches) for reading detail on maps; and lets you turn off battery-draining features like digital compasses.

Variables: In addition to traditional GPS units, we’re now seeing an explosion of GPS-enabled phones and Blackberries that combine multiple digital tools (GPS, camera, phone, text, calendar, browser, etc.) into one powerful handheld that can lock into satellites even outside of cell coverage. One cool use: imagine clicking a photo with a GPS waypoint embedded, then sending it to a Google Earth map wirelessly. The main downside to these phones is limited battery life.

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For This Type of Trip Look For These Features
Dayhike If you don’t buy an easy-to-use model unit, you probably won’t keep carrying it, so check the buttons and menu screens for intuitive operation.
Trail run Go light and small–like the palm-size Garmin Geko–or even smaller with a GPS watch. There are a handful of watches on the market now that record location, heart rate, elevation, and/or speed; note that most do not let you upload/download routes or POIs.
Weekend Your options vary widely here, depending on your terrain and preferences. The model you’d pick for dayhiking will be perfect for most on-trail adventures. If youre doing a little cross-country or want to perform more elaborate mapping, upgrade to "The Standard" described above. This will also improve your satellite acquisition speed and reception.
Off-trail hike The Standard or better. Opt for a big screen, big memory (for map downloads), and AA batteries (see below).
Expedition Same as for off-trail, but resist the temptation to get one of those pretty color screensthey suck serious energy.