Have just purchased and installed a GHP12 into a 43' sail boat.
We had a Robertson AP300 system with hydraulic pump and actuator.
First the main control board failed which we tried replacing with a second hand head
but then had problems withe the main control unit and the compass
Gave in and bought a new Garmin GHP12 with a new rudder
feedback unit as the Robertson/Simrad feedback unit is NOT compatible with the Garmin.
Have upgraded the power supply wiring
from the battery
to the hydraulic drive motor
as the previous wiring
was too small diameter for the potential current
Had to buy a longer cable from the CCU to the ECU and a lead from the ECU to the Hydraulic pump motor
To explain the components that Garmin supply and how they fit into your boat/yacht.
The basic GHP12 kit consists of:
ECU (eletronic control unit) that needs to be fitted close to your hydraulic pump. (less than 1m cable distance)
CCU (Course computer unit) has a compass
and control electronics
in it. Needs to be on centreline of boat and forward.
GHC10 Display panel and user interface
CCU/ECU interconnect cable (std is 5m long, make sure you get one long enough)
ECU power cable
GHC10 NEMA0183 Data cable (used for earth and one lead to turn the CCU on/off)
NEMA2000 drop cable 2m, 3x Tee's, end connectors, NEMA2000 power cable.
Additional Items We purchased:
5m and 2m NEMA2000 backbone cables
fedback unit with lead
CCU/ECU connector cable 10m long
Power lead for non Garmin pump
Crimp connector (sealing)
Plan the location of the three main components carefully and make sure you have the ability to run cables
with the plugs on the end (3/4" holes required).
We have a sealed rudder box under the cockpit
accessed from the aft bunks where we installed the ECU and the rudder feedback sensor.
This made sense for us as this is the location for the existing hydraulic pump.
Mounting and orientating the rudder feedback unit is crucial and so read the instructions before starting to ensure that when you are in confined space it goes in correctly.
The CCU we mounted on a small bulkhead in front of the engine
compartment. This is just forward of the keel
(we have a fin keel).
It was a 7.6m cable run from the CCU to the ECU. Tidied the excess cable into a roll.
The GHC10 display unit we mount in a Nav table next to the GPS
Chart plotter. Ran the other lead from the ECU/CCU intercnnect cable here to ensure yellow wire connected.
Set up a new NEMA2000 backbone from CCU area to the Nav table and connected the drop cables from CCU and GHC10 to it.
Also had to run power to the NEMA2000 network from the power panel so the instrument switch turns power on and off for network.
Ensure you have some small diameter crimp connectors with heat shrink with hot glue to connect very fine yellow wires from CCU and the GHC10.
Also larger diameter crimps for the power lead connection from ECU to your pump motor.
The main power to the ECU we up sized the cable to 10mm2 to account for up to 10A draw from the pump motor.
Installed the system myself over a long Sunday and then a few evenings and a full Saturday including dockside commissioning.
When I turned it on it worked first time so I must have been careful when wiring it up.
works well with just 2 x AA batteries, it is light and the screen
is visible in full daylight. It works over 90% of the boats length. Although does cut out in areas with other RF interference
. Warns that it has lost
Have done one of the on water
setups but had to abandon as the weather
was too windy and rough. Will go out again this weekend and report back.
At present do not have connection to anemometer (wind instruments).