As combo GPS/heart rate monitor devices go, the TomTom Multi-Sport Cardio GPS provides several innovative features, such as a treadmill function, three customizable points of data while in workout mode as well as several modes of tracking heart rate, and a GPS that pre-caches satellite information every time you connect it to computer so it can pick up satellite location in just a few seconds. The interval function allows the user to define a warm-up, workout period, number of reps, rest period and cooldown according to time or distance so runners don't have to think about what comes next during a workout. Connect the device to the TomTom MySports app on Bluetooth-enabled smartphones or to a computer to get basic workout and map data for each run. The rigid plastic "pod" can be a bit uncomfortable on the wrist and there's a bit of a learning curve with the "Joystick" interface (directional button embedded in the wrist strap).