StartClock is a start clock for orienteering and other sports with interval start. StartClock can be used by coaches to simulate real starts at trainings or at competitions as a cheap alternative to the prevalent start clocks. StartClock will, under reasonable conditions, run for at least five hours if no other applications are running. StartClock uses the internal time of the device, but the time can be synchronized within a second of any other time. Features include different beep intervals (10, 15, 30, 60seconds and 1.5, 2, 2.5, 5, 10, 15 min beep intervals), different formats for the time (HH:mm:ss, HH, mm, ss), Night mode. Multiple devices can be used together to create a start clock that can be seen from far away.