I have a Simrad
(nee Robertson) AC42 pilot computer. I have been using it with an Airmar H2183 rate compass
for I guess 8 years by now.
talks to the pilot over N2k. As far as I can tell from the manual, it only speaks three PGN's:
127251........ Rate of Turn
For the life of me, I can't figure out which PGN's the AC42 can use.
Now I've acquired a Furuno
compass, which according to the specifications is 4x more accurate for heading and 6x more accurate for attitude, and with 50hz vs 20hz attitude update.
It speaks a plethora of PGNs giving a wealth of data. Unfortunately many of them appear to be proprietary:
065280. . . . . Heave
127250 . . . . . Vessel Heading
127251. . . . . . Rate of Turn
127257...... .... Attitude 127257 - Attitude Category: Steering This PGN provides a single transmission that describes the position of a vessel relative to both horizontal and vertical planes. This would typically be used for vessel stabilization, vessel control and onboard platform stabilization.
127252. . . . . . Heave (again)
130577. . . . . ..Direction Data (what is that?)
130578. . . . . . Vessel Speed Components (This PGN provides a single transmission that accurately describes the speed of a vessel by component vectors)
130842. . . . . . Six Degrees of Freedom Movement (wow)
The last thing has got to be supremely valuable for an autopilot
which can use the data, but I guess the AC42 can't. Would also be supremely valuable for correcting induced wind
at the mast head
But now I don't know how to set any of this up. I guess I need to switch off the PGNs which are not being used by anything -- I have a lot of devices on my network.
I'm guessing that the pilot is only interested in 127250, 127251, and 127257, and I need to turn off everything else -- can anyone confirm that? Does anyone understand, or can point me to information about how the pilot uses this data?