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Track your speed and distance while wearing a Polar training computer with the Polar G1 GPS sensor. A terrific alternative to the Polar S1 foot pod, the G1 is compatible with the Polar RS200, RS400, S625X, and S725X wrist-top training computers.
Once you're wearing the G1, the sensor employs SIRF StarIII GPS technology to measure speed and distance for sports that don't exceed 18.3 miles per hour, such as running, kayaking, cross-country skiing, or recreational inline skating. As the G1 compiles the data, your training computer will do the rest, putting you through the paces on your workout routine.
The easy-to-use, water-resistant sensor calculates its position by measuring the distance between itself and three or more GPS satellites. Note that GPS positioning requires satellite visibility to work, thus it will only work reliably outdoors, and not in valleys between tall trees and buildings.
GPS signals also rely on radio frequencies (RF), and therefore won't go through metal or water. The G1, which works with AA batteries, offers a battery life of up to 10 hours in warm conditions or up to 15 hours in low-power mode. The sensor also weighs a lightweight 2.82 ounces.
About Polar
The first EKG accurate wireless heart rate monitor was invented by Polar back in 1977 as a training tool for the Finnish National Cross Country Ski Team. The concept of "intensity training" by heart rate swept the athletic world in the '80s. By the 1990s, individuals were looking to heart rate monitors not only for performance training needs, but also for achieving everyday fitness goals.
Today, the same concept of heart rate training is being used by world-class athletes as well as everyday people trying to lose weight. Polar is the leading brand among consumers, coaches, and personal trainers worldwide, and the company is committed to not only producing the best products, but also being the leading educator on the benefits of heart-rate-based exercise.
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Designed for runners, cyclists, inline skaters, and other athletes in training, this compact device keeps track of current, average, and maximum speed (kph or miles per hour), distance, pace, lap history (up to 50 laps), calories burned, and even current altitude. The watch straps on comfortably to your arm and, using a technology called "global positioning," gives you precise and up-to-the second readings on a clear and easy-to-read display. To keep you on track, the watch features pace control and a programmable target zone with a built-in alarm to alert you both when you're in and out of your target zone. Fully water-resistant, the R300 also features regular watch functions (date and time), as well as an automatic timer. Included with the watch are an arm strap, user guide, and one AA battery with a 16-hour life.