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Compare OS Series models - Optimum Time Sailing Watches

There are lots of models to choose from when picking the right Optimum Time for you, and each model suits a different type of sailor. We’ve put together this guide so that finding the perfect one is easy!

Models

There’s some functionality that all our timers share:

Water-resistant to 5 ATM with shock-resistant construction.
Features the time, a calendar, and a time of day alarm.
A count-up (from zero) timer.
Programmed countdown timer with an alarm, including a pre-programmed 5,4,1,0 ISAF, 3 min or 1 min starts sequences with audible warning signals (which can be silenced, if preferred). There's also a sequence repeat option.
The incredibly useful sync button synchronises your countdown to the race control timer, so you won’t miss the gun.

Information	Models
Information	OS Series 15	OS Series 14R	OS Series 12R	OS Series 11	OS Series 3
Description	The latest in the Optimum Time line-up, combining many of the most loved features into a neat, modern and durable package. It is designed to be worn from deck to dock with a mid-size bezel, striking the perfect balance between 'wearability' and visibility in the heat of the start.	All the functionality of the series 3 timers, and it also comes with a rechargeable battery, vibration alarm, and higher-spec screen. This is a sailing competitor’s best friend. It can be strapped to a mast or you can comfortably wear it over your sailing kit.	This has the same features as the series 14R timer but as a wristwatch with a smaller bezel, so it’s ideal for the deck to dock wear. It comes with a soft silicone strap instead of an elasticated one.	This is a superb race timer aimed at the novice sailor with all the basic functionality required and available in a fantastic choice of colours. This timer has the smallest display size in the sailing range, at 26mm diameter, making it perfect to wear on land too.	The original and iconic ‘big yellow timer’, is still the top choice for competitors around the world today. This jumbo timer is much larger than your average watch with big buttons, making it easier to use during your start sequence. The elastic wrist strap is easy to fit over your sailing kit, or you can attach it to your buoyancy aid or the mast.
Diameter display	29.00 mm	36.00 mm	28.00 mm	Clear display	Massive 38.00 mm x 20.00 mm
Digits	12.50 mm digits	13.00 mm digits in normal mode and massive 23.00 mm digits for the final 59 seconds	9.00 mm digits in normal mode and large 19.00 mm digits for final 59 seconds	10.00 mm digit height	6.00 mm digit height
3-row dot matrix display to show time and timer together	-	Yes	Yes	-	-
Electro-luminescence backlight	Yes	-	-	Yes	-
Adjustable viewing angle	-	Yes	-	-	Yes
Boom/Mast mounting bracket supplied	-	Yes	-	-	Yes
Features	Comfortable to wear with a grippy and soft silicone strap.	Buttons are widely spaced for easy operation when wearing gloves.	High-temperature LCDs suited to severe warmth and UV rays.	Comfortable to wear with a soft-touch PU strap.	High-temperature LCDs suited to severe warmth and UV rays.