Suunto Spartan Trainer Wrist HR User Guide - 2.6
Moon phases
In addition to sunrise and sunset times, your watch can track moon phases. The moon phase is based on date you have set in your watch.
The moon phase is available as a view in the outdoor style watch face. Press the top left button to change the lower row until you see the moon phase.
The phases are presented as an icon with percentage as follows:
