Tack settings

[seandepagnier]

tack.angle - angle to turn through tack, usually 100 degrees
tack.speed - how fast to tack
tack.delay - how long to wait before tacking once you press tack button
tack.complete - what point while tacking to switch back to autopilot holding the new course

Turn through tack... so you point your sail boat into the wind and sail 100 degs off your original heading?
how fast to tack meaning? rudder angle? I don't understand 

How fast to tack is how quickly to move the rudder to tack.

I am trying to use this to do a 180 gradual turn while trolling in a motor boat. What settings would you use..
My guess is 
tack.angle - 180
tack.speed - as low or slow as possible? so 1
what is ap.tack.threshold?

Not sure you will get exactly what you are looking for with the tack function here. In any case, threshold is really what I described complete. So if you set it to 0.75, it would turn 120 degrees and then change back to autopilot with a new course of 180 different, so eventually turning the last 60 degrees using normal autopilot course correction (which is generally slower than tacking)

Also since I started using the pypilot plugin with opencpn on my RPi the tack options no longer appear? I running the latest version 0.5 according to git

I'm not sure, I need to improve the tack interface as well as the rudder centering function. I hope to post updates to the plugin on github soon.