Changes

* '''Heart Rate Variability'''. There is a growing interest in the possibility of using [[Heart Rate Variability]] (HRV) to evaluate training stress. While only one device will display HRV, there are several that will record HRV for later analysis.

* '''GPS Pre-cache'''. Some newer watches will download the predicted positions of the GPS satellites for faster initial acquisition. This pre-cache works remarkably well, and the data is usually downloaded automatically when the watch is connected to the internet. However, the data is only valid for a few days, so after that time the device will fall back to the usual approach of scanning for satellites.

=Using a Smartphone=

''Main article: [[Running With A Smartphone]]''

Most smartphones have a GPS built in and support various applications that allow them to function as sports watches. These phones can have remarkable levels of [[GPS Accuracy]] as well as many other advantages.

While [[All models are wrong| all analogies are flawed]], they can sometimes be useful. This is a lighthearted look at what type of sports car each of the watches I've reviewed would be.

* [[Garmin 310XT]], [http://www.edmunds.com/lotus/elise/ Lotus Elise]. While it's not the latest car, the Lotus Elise produced in the 2000's is a stunning automobile that surpasses many far more expensive and modern machines. It lacks the bells and whistles you might have come to expect, like electric windows, stability control, ABS, seat cushions, but it makes up for it in the driving experience.