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jarekg said.. Hi I am quite new on this forum but topic of GPS measuring is hot for me - I found another interesting alternative for GT-31 unit from VELOCITEK. In fact they offer pro sailing machines on their website, there is good real time demo for these units as well and they are full waterproof + optimised for real time speed and position monitoring - definitely it is interesting and worth to check:
www.velocitek.com/ 1. prostart - unit optimised for start time countdown and the GPS monitoring
Technical SpecificationsSpeed Accuracy: ±0.2 KnotsHeading Resolution: 1°Display Update Rate: 2Hz (twice a second)Water Resistance: 3m / 10 ft (IPX-8)Display: 30mm / 1.18” digit height 120° viewing coneData Logger: Lat, Long, Time, Speed, and Heading recorded every 2 seconds, 30hr capacity. Data download is compatible with Mac OS X and WindowsBatteries: 3 x AA, 20+ hr endurance, rechargeable or disposableDimensions: 120mm x 175mm x 40mm / 4.72” x 6.89” x 1.57”Weight Including Batteries: 448g / 0.99lbBracket Compatibility: Velocitek ProStart Mast Bracket or any Tacktick Micro Compass bracket.GPS Chipset: u-blox LEA-5MWarranty: Two years
2. speed puck - looks like it is good for speed surfers, too
Speed Accuracy: ±0.2 KnotsHeading Resolution: 1°Display Update Rate: 2Hz (twice a second)Water Resistance: 3m / 10 ft (IPX-8)Display: 27mm / 1.06” digit height 120 degree viewing coneData Logger: Lat, Long, Time, Speed, and Heading recorded every 2 seconds, 20hr capacity. Data download is compatible with Mac OS X and WindowsData download requires Windows XP, Windows Vista, Windows 7 or Mac OS X 10.6.Batteries: 3 x AA, 20+ hour endurance, rechargeable or disposableDimensions: 115mm / 4.5" diameter, 27mm / 1.06" thick.Weight Including Batteries: 295g / 0.65lbGPS Chipset: u-blox LEA-4AWarranty: Two years
your opinion?
Sorry I did not mentioned that both units work with parametrs described below:
"Speed is calculated by the GPS unit by measuring the Doppler shift in GPS signals.
The device can be configured to record data every second, every 2 seconds or every 4 seconds. The SpeedPuck can store up to 20 hours of data when recording GPS data every 2 seconds.
prices are unfortunately very hi...
399 for speed puck and
499 use for prostart but especially prostart looks like very professional tool for those who are keeping focused on sailing, so it could be definitely suitable for windsurfers, too.
the most important functions of the prostart device (from the manual):
Speed, compass, and distance to line updated
twice a second ? Count down start timer
? Header/Lift indicator updated twice a second
? Maximum and best 10 second average speed recall
Waterproof (IPX8) to 3m