The Optimum Time 315 sailing watch, this watch features a large 65mm Overall ABS case with a 38 x 20mm display screen, 16mm high digit single row display, Adjustable viewing angle, Boom/mast mounting bracket supplied, Elasticated strap for wrist or over sleev wearing, Water resistant to 5ATM, Shock resistant design, 12 or 24 hour normal timekeeping mode.
Specialist sailing timer functions incl
Countdown repeat option, Countdown and up to show elapsed time for handicap races, 5, 4, 1, 0  ISAF start sequence pre-programmed with audible warning signals (but these can be turned off),  5, 3 and mulitples of 1 minute programmes as well, "Sync Button" for if a gun is missed, Electro-luminescense backlight feature