Heave data out to signalk

[mgrouch]

I'm making a somewhat educated guess here, but from what I have gathered from my research it is measured in distance up or down from boats normal (resting) height, my guess is in Meters.  As the boat rides up a wave, the distance to bottom increases, so the heave value goes up, and is applied as a negative to the depth reading to provide a heave compensated reading.

Take a look at this link https://bareboat-necessities.github.io/m...-math.html
It should give you idea how to calculate it. There are code parts in python and links to
rust code as well.