Marine autopilot setup for the Australian east coast

East-coast Australian passages are long, sunny and interrupted by bars, shipping and the odd southerly that turns a “set and forget” run into a gybe. Autopilots earn their keep on the hops — Gold Coast to the Wide Bay, the Fraser inside, Mackay to the Whitsundays — and they embarrass themselves when the drive was sized for a lighter hull or the heading sensor sits next to a speaker.

The old AM Wholesale list treated autopilots as part of the navigation desk, next to plotters and instruments. That is still the right shelf.

Size the drive, not the display

A pretty control head on an undersized ram will hunt, overheat and then fail on the first lumpy night. The computer and the drive (linear ram, rotary, or hydraulic pump) must match displacement, rudder torque and the speed you actually cruise. Manufacturers publish tables. Use the next size up if the boat is heavy, has a dirty bottom, or tows a tender.

Sailboats need a clutch and a ram that can be overpowered by hand. Power boats need a hydraulic story that does not steal the only pump the steering has.

Heading is the product

A fluxgate or satellite compass, mounted away from engines, winches and speakers, is the difference between a straight wake and a sine wave. Calibrate it on a clear, open stretch — not in a steel marina. Then confirm the MFD and the autopilot agree on the same heading sentence over NMEA 2000.

GPS course-over-ground is a backup, not a compass.

What “east coast” actually asks of the unit

• Bars and inlets: you will hand-steer. The autopilot’s job is the miles either side.
• Shipping: pair the computer with AIS and a plotter that can send a heading-aware route, then still keep a watch.
• Trades and northerlies: wind instruments that talk to a sailing autopilot are worth more than another inch of glass. See the electronics hub.
• Power: clutches and pumps are real loads. A tired house bank will drop the pilot at the worst time. Read onboard power.

Commissioning

Sea-trial on the water you will use. Set rudder limits, gain and counter-rudder until the wake is boring. Then do a night hour, because that is when you learn whether the backlight, the alarm and the dodge buttons are where a tired hand can find them.

If the glass family is still open, the brand comparison includes autopilot heritage. Raymarine and Simrad did not get their Australian reputations from screens alone.