Thanks to this small wireless device (3 AA batteries) you will no longer hesitate to get on the starting lines since it will tell you every half second one how far you are from the line. 'May you tell your teammates to press the right button when you are at the Committee boat, then on the left button when you are at the end of the line. "Gun" button, and your counting is set out. A synchronization problem? You can simply intervene. Prochence finished, crossing line crossed, the swap prostart alone on the other functions: instantaneous speed, cap, it records your position in a few seconds and indicates to you by a simple graphic the wind oscilliations! All this thanks to GPS technology so precise and instant information! When you get home in the evening, you can find your races on your PC or Mac since it records up to 30 hours of data Speed: +/- 0.2 Nodes Cap: 1 degree Up to date: 2Hz (all 0.5 sec.) 3m display height: 30mmen recording: latitude, longitude, time, speed at the frequency of 0.5Hz (Once every 2 SCDS), 30 hours of memories. Compatible with Mac OS X10.6 and Windowspiles: 3 AA for 20 hours of autonomy (disposable or rechargeable) Dimensions: 120mm*175mm*40mmpoids with included batteries: 448gsupport Compatible: Velocitek prostart matt support or other tactical compass support: U-Blox lea-5mgarantie 1 Anspeedometrechronotimergstraceur