Why knot meters on sailboats often have a bias when on either a port or starboard tack that significantly changes the reading. Describes why this happens and how to calibrate your own knot meter.
This video is part of the series "How Sails Really Work"
1) Introduction https://www.youtube.com/watch?v=uYMymIL1aF0
2) Jib and Mainsail https://www.youtube.com/watch?v=AqITM0aIQyM
3) Velocity Made Good (VMG) https://www.youtube.com/watch?v=1JlbeS294vk
4) Reefing the Mainsail https://www.youtube.com/watch?v=Gq5g0SeHkIY
5) Sail Shape https://www.youtube.com/watch?v=IJ4er8vvTPw
6) Building your own Chartplotter with a Raspberry Pi and OpenCPN
https://www.youtube.com/watch?v=PdfLTA2CRL8
8) Sail Trim - A Conceptual Model https://youtu.be/0vtXhU45S_w
