Optimum Time OS 434 Sailing Wristwatch Blue Colour - Fashionably oversized case with soft touch PU strap and stainless buckle,Large 11 mm upper digit height and 6mm lower digit height,Water Resistant to 5 atm plus Shock Resistant Construction. Dot matrix panel to aid function selection,Normal Timekeeping Mode, Calendar, Alarm function. Specialist Sailing Countdown repeat option or Countdown and Up to show elapsedTimer Functions: 5,4,1,0 ISAF start sequence pre-programmed withtime for handicap races “Sync 5 minute,3 minute and 1 minute programs aswell audible warning signals Electro-luminescenceButton” for instant synchronisation if a gun is missed. backlight feature PLUS Tidal Predictions and Compass