The Suunto Spartan Range features GPS, Bluetooth, a huge range of sports functions and a colour screen with some models having a colour touch screen.
The Spartan Ultra has the most features, the largest face and the longest battery life.
The Spartan Sport is a sports version of the Ultra with the same sports functions plus the compass but without the outdoor functions and in a slightly slimmer design. This also includes the Wrist HR version.
The Spartan Trainer is a slimmed down version of the Sport Wrist HR with purely sports functions and a Wrist HR but no touch screen.