This unique water resistant starting timer has huge 30 mm digits and a synchronize function in case you missed a signal. Beeps during the last minute every 10 seconds and during the last 10 seconds every second. Sound is on/off switchable.
 
Water Resistant (IP67)
Floats
Quick set/reset
Rigid casing with 3m velcro fixing
Replaceable AAA battery
Dimension: 90 x 76 x 23 mm
Auto shut-off

Also available, a universal timer bracket (EX3012). You can now fix the timer anywhere you want. Screw the bracket to a flat surface or fix it on a mast or boom with the provided back to back velcro strap. The bracket can also be fixed to an airbag strap of an Optimist dinghy.