More accurate than any previous system known to man, GPS (Global Positioning System) are used as navigational tools to determine specific location data. GPS tracking watches, use twenty-seven satellites and a broad network of computers to calculate the user's latitude and longitude to within a few meters.
With wearing a GPS tracking watch, its simple to track your location, speed, direction and distance to your destination and many more functions. You can save and chart trips, retrace your steps back to your starting point, program routes in advance, and save the coordinates of interesting locations.
Even in conditions of low visibility, you'll know how to reach your destination, and know right where you are. A lot of models also include a Barometer, Compass, Altimeter, and advanced memory functions.
A barometer is an instrument that measures atmospheric pressure, or air pressure. With a barometer you can forecast upcoming weather, low-pressure weather systems tend to bring cloudy skies and precipitation, and high-pressure systems usually come with very few clouds or precipitation. When the barometric pressure drops, its time to be watching for more clouds and maybe bad weather. So, a GPS tracking watch that can read barometric pressure is a convenient and useful way of staying informed of upcoming weather conditions monitored right on your wrist.
Of course a digital compass is an extremely useful function to have in a watch. Whether you're navigating through an unfamiliar city, hiking through the backcountry, or sailing on the ocean. There are slight differences in compass functionality from GPS tracking watch to GPS tracking watch, but most models feature:
* Bearing in degrees
* North-south arrow
* Bearing tracking
* Declination adjustment
* Rotating bezel
* Resolution of 1 degree
An altimeter GPS tracking watches is a wrist top instrument that allows the wearer to determine their current elevation. Of course, that's not all – combined with memory, an altimeter watch can keep track of your total and cumulative vertical ascents and descents, as well as the number of runs (for skiing or snowboarding, for example). In some watches, the altimeter can be used to estimate your vertical speed, or sound an alarm when you reach a set altitude.
The altimeters used in GPS tracking watches base their measurements on air pressure – in a nutshell, the lower your altitude is, the more air there is above you is, and the heavier it is. So when you move uphill, the air pressure sensor in the watch detects the decreasing air pressure, and automatically converges the pressure drop into a reading of your increasing altitude. Of course, it is not easy to get perfectly accurate measurements of altitude, because there are many factors that can cause air pressure to fluctuate.
This is why many altimeter watches feature "temperature compensation," and why the altimeter must be calibrated regularly (by simply entering the current barometric pressure or setting to a known altitude).
An altimeter is an important and useful piece of gear for many outdoor activities, including running, biking, and hiking, skiing, or snowboarding. Pilots of small planes often wear an altimeter watch as a back up in case of instrument failure – although be aware that an altimeter of this type can not be used successfully in a pressurized plane.
There are also various models that have built in heart rate monitors and other built in functions.
Heart monitors are one of the few pieces of equipment more important in fitness training. Serious cyclists, runners, and other athletes know that you can only determine how effective your training regimen is by keeping track of the relationship between your workout and your heart rate. There is not a more convenient way to do this than a heart GPS tracking watch with a built in heart rate monitor. Some GPS tracking watches use a chest strap to monitor your heart rate, and send data wirelessly to the watch.
One model allows you to program the GPS tracking watch with your upper and lower heart rate limits and alerts you if your heart rate goes outside the programmed ranges. It also monitors how your heart rate changes with altitude, and keeps tracks of your highest, lowest, and average heart rate while you're training. GPS tracking watches also allow you to upload your data to your PC where you can use the included software to analyze, compare, and save your own personal stats.