Calibration of Instruments - Wind, Speedo

[rgleason]

Some resources for Sailing Performance.

"The most important mission of an instrument system is correctly reporting wind direction...if lifts or headers occur every time you tack or gibe, there is a problem with your instrument calibration. DeWiggler is the solution to this problem."
"Wind direction is derived from apparent wind, boatspeed and heading. Wiggle is reduced by correctly calibrating these three inputs."
DeWiggler - Ockam Sailing Instruments

Importance of true wind http://www.ockam.com/2013/05/17/impo...-of-true-wind/

"There is also another important environment variable that greatly affects performance; current. ..
We call Current Wiggle the change in current calculation with heading. Current is derived from boatspeed, heading and GPS course/speed over ground (COG/SOG)."
Sailing in Current - Ockam Sailing Instruments

"Notice that boatspeed and heading are common to both wind and current wiggle. Therefore, boatspeed and heading should be the first sensors to calibrate. Boatspeed is fairly straightforward; timed runs over a known distance. However compass calibration is more involved."