I've listed these two products together because they are almost identical except in one key feature: batteries. The 101 model uses a pair of AAA batteries while the 201 model uses a rechargable lithium cell. For multi-day, backcountry use, the former may be a better idea. For day-trips, the latter may be better. The product description below is for the 101.
This full-function, easy-to-use wrist-top navigator weighing in at a mere 2.6 oz. is lighter than many sport watches!
* Simple, single-hand operational system features six ergonomically situated buttons that intuitively guide you through functions
* Navigate for up to 15 hours on two AAA batteries (based on typical use)
* WAAS (Wide Area Augmentation System) enabled receiver delivers accuracy within 3 meters or better
* For the mariner, sail race feature allows you to configure the start countdown sequence with audible alerts at each start phase
* View route and follow it back with Garmin's exclusive TracBack® feature
* Navigate 20 reversible routes; stores 500 waypoints with name and graphic symbols and 10,000 trackpoints
* Trip computer calculates current, average and maximum speed; also tracks trip time and calculates distance
* Computer-compatible design allows you to load waypoints and routes directly from your computer (cable sold separately)
* Waterproof construction, meets IEC 529 lPX7 standard (functional after 30 minutes submerged in 1 meter of water)
* High-contrast screen with bright (orange!) LED backlighting for use in low-light conditions