Originally Posted by faa50
My i70 Raymarine display (2013 unit) consistently is reporting wind speeds at higher knots than actual wind speed. At low wind speeds instrument is typically 5 kts high and as wind speed increases the variance between actual wind and reading on display increases to 10 or more knots (i.e. actual 46 kts display reading 57 kts). I contacted Raymarine tech support and was told to drive the boat slowly around in a circle so as to calibrate the wind instrument. I plan to do this but don't have much confidence that this is the solution. That solution seems to address wind direction and not speed of wind.
Anyone had a similar issue with this equipment and how was it solved. Boat is a Lagoon 39 2014 model. Anometer at top of mast is about 2 1/2 yrs old.
As others have noted, there can be a significant windspeed (and direction) difference at the cockpit
level and mast head
I use a Davis ultrasonic handheld wind speed indicator (held as high and as far out of sail/vessel induced air turbulence as I can).
Then I set the wind instrument calibration factor to read the same.
Then to appease the admirable (on my own boat) I set the calibration factor to read about 30% less. ;-)
Note that +/- 0.5% accuracy is not necessary. +/- 1 knot
repeatability (at same actual speed and wind direction), sufficient to repeat sail trim in like conditions, is the best one can hope for.
Certified Raymarine Installer / Service