ComNav Marine Ltd. - Products Index
I believe you will find the Si-Tex pilots are built by Comnav Marine
Comnav make excellent pilots.
I was in marine electronics
for 30yrs-commercial fishing
I sold & serviced most of the major brands,& Comnav is one of the best.
Believe it or not,most Ap will steer the Queen Mary,as long as it has a good heading sensor & the correct drive unit for the rudder
. The drive unit is where most performance problems occur.Also,you can use many different brands of drive units.ie: mix & match. You are not limited to using the same brand of drive as the the control unit.
Many of the entry level/inexpensive AP's skimp on the drive unit to keep the pkg price
,for the most part will work just fine.
Another problem is that first time AP owners expect the pilot to sreer a perfect +/-1deg. course in all sea conditions.Won't happen!
Some boats steer better than others. As a test,take boat out in 3-4' stuff.Manually steer the boat,under power,in four 90deg. different directions.Get on a course & hold the tiller/wheel steady-do not turn it. Note how many degrees the boat wanders back & forth in each direction,by watching your steering compass
.This wander is "normal".
Don't ask a pilot to steer any better,or it will beat the drive/rudder system to death trying. Also,your eyes let you react to an oncoming sea before it hits/affects your boat.An AP has to wait for the boat to be knocked off the set course before it can react.
A good helmsman can steer a tighter course than any AP,over the short term.An AP may let the boat yaw a bit more than a human in the short term,but will steer a better average course in the long term,cuz it never takes its eye off its compass
. Jus my experience & opinions. Cheers /Len