GPS running watches are a recent invention in sport watch technology and have the ability to link up to the GPS network of satellites to determine your precise location on earth. By calculating slight changes in your position, a GPS watch has the ability to calculate your speed and distance which opens up the possibility of offering new features for runners. Some of the most notable of these, other than the ability to display real-time speed and pace on the watch while you're running are speed, pace and distance alerts, that can notify you when you are have dropped off your target pace or are overdoing it in pursuit of your target time.
When performing an interval training session where you alternate between a hard rep and slower recovery, GPS watches feature the ability to automatically record lap times based on distance rather than time - the standard method found in most running watches that feature an interval timer feature. Popular GPS sports watches such as those in the Garmin Forerunner series also have the ability to automatically pause the running stop watch at the same time that you stop moving, say when you are forced to stop due to traffic lights or some other disruptive event.
A common problem with a GPS watch, that runners often complain about, is it's size and bulkiness due to the need to mount the aerial inside the wristwatch. While the size of the aerial has been reduced over time and is now with the release of the new SiRFstarIV receiver is smaller and lighter than ever, an alternative option is the purchase a sports watch that implements the receiver in a separate device worn externally on the body. There are advantages and disadvantages with this approach. While the size of the wrist watch stays small with this method, the external device must be strapped to your body, which some might find uncomfortable and a burden to set up before starting each run. An external device also requires batteries that must regularly be replaced, compared to one-piece watches like the Garmin Foreunner watches, that are rechargeable.
If you're looking to take the maximum advantage of the GPS technology, you will probably want to consider purchasing a Garmin Forerunner GPS watch. The particular model Forerunner watch will depend on your particular needs, the new Forerunner 110 and 210 watches are more user-friendly than Forerunners of the past, but with the advanced features of the older 405CX stripped out, meaning they are more for people who want a few simple features and the ability to just put on their sports watches and run. If you are looking to stretch the maximum potential of your GPS watch, then the new Forerunner 410 is a highly recommended choice.
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