We sailed our Whitby 42
ketch from the US to
Mexico and then on to NZ. Fortunately we didn't have to comply (at that time at least) with the rigorous
regulations and required
equipment which NZ and Oz require.
We had a
Monitor windvane and it was great. We had to use the shorter version of the vane because of the
interference with the mizzen boom. All windvanes require the proper trim of the boat/sails since none of them can push against a boat which is working against them. I am sure the
Hydrovane and
Monitor would
work well for you.
As far as qualifying as a second steering system that would depend on the exact wording and enforcement of NZ. The Monitor goes through your existing steering system so is not really independent of it. I am not familiar with Moody's and what type of steering they have. We had hydraulic on our boat. We also had a
electric pump/hydraulic
autopilot below
deck. A Monitor would not give you any more independence from a steering failure than an
autopilot. However, a
Hydrovane would certainly. I was going to put one on my
current boat but have to sell now.
An emergency tiller might by itself be all you need to qualify as a separate steering system. It would be more independent from your hydraulic system but you would have to have a way to allow the rudder to move and not fight a closed hydraulic system. This would be a good thing to have on your boat in any case.
If the
regulations require the instance of losing your ship's rudder, then you will have to do far more than is usually possible than most
boats. The Monitor requires lines going from the stern up to your
helm wheel and that is a major consideration and negative. It would not be an emergency rudder if you lost hydraulics or chain/cable linkages.
I would certainly look into a Hydrovane if you want the luxury of a
wind vane. I almost consider them essential kit on a cruising boat. They are quiet and don't use any power. Hydrovane has a lot of experience with all different types of rigs and they have been put on many ketches. They are very, very easy to
work with. I actually bought one to put on my
current boat and would if I were keeping the boat. You can steer the boat by hand using their independent rudder. The regular one is small and would have difficulty in bad seas and winds but they also have a separate emergency rudder kit that can be added. I did a lot of
research on wind vanes and it would be the only one I would consider in the future. But other sailors have been very happy with Monitors and others.
But it seems the biggest issue is what, exactly, the regulations require.