Features:

• Keep tabs on your distance, speed and pace and more with accurate GPS tracking
• Easy-to-use interface consists of only two buttons and a small, monochrome LCD readout
• Includes distance, calories burned, lap timer, altimeter, clock and target pacing functions
• Changeable faceplates let you dress up your Navman's water resistant case
• Small size makes it easy to wear with included armband

Editor Reviews:

Product Description:
Navman Sport Tool R300 is a modern performance-measuring device. The Sport Tool uses the latest GPS satellite technology. It gives athletes all the necessary ultra-precise information: speed, distance, lap times, etc. - easily visible on the integrated display. Training is more effective, and performance can be measured immediately. With accurate and up-to-the-second readings, performance is measurable, training is more effective. You just get more fun out of your sport.Introducing the R300 - with all the features you need to make training even more effective. 10 km, 20 km, marathon? The R300 gets you closer to your goal. And that's what fun is all about.

Amazon.com Product Description:
If you're a runner who likes to keep tabs on your distance, speed and pace, the Navman R300 is for you. No more clunky pedometers; this small device, which attaches to your arm, uses GPS technology to locate and track your position with precise accuracy anywhere on the globe.

The R300's simple, easy-to-use interface consists of only two buttons and a small, monochrome LCD readout. On it, you can view your current, maximum and average speeds. Based on these measurements, the unit also tracks distance and calories burned. Plus, you can use an automatic timer, lap measurements, and target and pace settings to manage your training goals. And if you're traveling in the high country, you'll like the GPS-based altimeter function. And of course, the R300 even tells the time and date (using a super-accurate GPS-based atomic clock!).

The R300 features changeable faceplates so you can dress it up to suite your style. Its diminutive size (79 x 78 x 27 millimeters) and weight (120 grams) means it is easy to wear with the included armband. Battery life via a single AA battery is rated at up to 16 hours and there is a handy battery life indicator on the LCD screen. The R300's rubberized, water-resistant case is ready for adverse conditions.

What's in the Box
Navman R300, arm strap, one AA battery, quick start guide, user's manual, product registration card.

Rating : - If you get a well-made unit, it's alright.
These things aren't inexpensive, especially for a college student, but I run a lot and wanted something to help chart my progress. The first thing I noticed was the poor reception. It takes about 5-6 minutes of clear skies to sync with your local satellites, but that isn't as much of a hassle as it might seem. Just turn on the unit when you leave the house, do your stretches outside, and it should be ready by the time you are.
The other issue is that it loses the signal often; if you live in an area with tall buildings, mountains, wooded areas, telephone poles, or flocks of geese flying overhead, you can expect to hear the "Sync Lost" beep at least a few times whenever you go out. This isn't a huge issue unless you're running around the block in an urban area as the device is smart enough to "connect the dots" between where you were when it lost the signal and where you are when it regains the signal. If you're running in more or less a straight line the results will come out within 10% of true distance. If you're the type of person who cares whether you've gone 8 miles in the last hour or 9, invest in a map.

Despite the signal issues, I would have given the unit 3 or even 4 stars. You can account for the syncing time by stretching outside, and you can adjust for the distance errors by adding 5-10% at the end of your run. The reason it gets two stars is that my LCD display started failing after about a month and less than 100 miles. It was still usable for another month or so (in that I could figure "Ok this is either a 6 or an 8, and I know I ran more than 6...), and then the display failed completely and the device became a GPS paperweight.

I realize this is almost certainly a QC issue and you aren't likely to get a bum unit like I did, so it gets 2 stars instead of 1. It's useless to me, though.