This is not a difficult job - depending upon how good your access is but Raymarine
marks everything very well. The only problem I had is that when I did seatrials and did the AutoLearn mode it always failed. This is because I had the wires in backwards to the motor
so when it thought is was steering
to port the boat went starboard. After a 3 minute job of switching the wires over the unit has worked perfectly ever since.
I was removing and replacing my old ST4000 unit, so I simply just removed all the old parts
and replaced with the new ones and then redid all the wiring
. This job took about 4.5 man hours with no seatrials/calibration included. I expect if one had to do it all from scratch it would take about 6 - 8 hrs.
The four items to mount and wire together are:
1. flux compass
2. controller (electronic)
3 controller head
(wires to controller)
The only thing that i haven't done is wire the unit to the Garmin GPS
440's that I have....if anyone has done this NMEA
interface before let me know.