Autopilot for Single Outboards: Drive Choices

Why the drive choice matters for a single outboard

The drive is the part of an autopilot that moves the steering. On a single outboard boat, the drive has to work with the steering system already aboard. The two main drive families you will see on listings are hydraulic pumps and linear drives.

Hydraulic pumps connect to a boat's hydraulic steering system. Linear drives are mechanical units that push or pull a steering link. For a single outboard, the right choice depends on whether the boat steers by hydraulic pressure or by cables and rods.

This article compares these drive options in general terms. It does not give installation steps. The maker's manual and a qualified installer decide what fits your boat. For a broader overview of drive types, see the marine autopilot buying guide.

Hydraulic pump drives for single outboards

A hydraulic pump drive is a common match for outboard boats with hydraulic steering. The pump moves fluid to turn the steering cylinder, which moves the outboard. Listings may name a pump by type, such as a Type 1 or Type 2 hydraulic pump.

Raymarine's drive unit pages describe hydraulic pumps for boats with hydraulic steering. The pages list pump types by steering system volume, but the exact figures are on the maker's page. For a single outboard, a smaller pump type is often the starting point, but the maker's guidance decides.

A hydraulic pump drive is usually part of a complete autopilot pack or a core pack. The pack title often names the pump type, so you can compare listings on that stated detail. See the best hydraulic autopilots guide for packs that include pumps.

Linear drives for single outboards

A linear drive is a mechanical unit that extends and retracts to move the steering. On a single outboard, a linear drive may mount to a bracket near the engine. The drive pushes a rod that turns the outboard.

Raymarine lists a Type 1 Linear Drive Unit for boats up to a certain displacement. The maker's page gives the figure. For a single outboard, a linear drive is an option if the steering is mechanical or if the maker approves it for the boat.

Not every outboard boat can use a linear drive. The steering system and the mounting space decide. A listing may name a linear drive as the included drive, so you can filter on that detail. The core packs guide shows packs that may omit or include a drive.

Bracket linear drives: what the name means

Some linear drives are described as bracket-mounted. The name tells you where the drive attaches: to a bracket near the outboard, not inside the hull. This is a general description, not a specific product line.

A bracket linear drive works with the outboard's tilt and trim. The drive has to move with the engine when it tilts. The maker's manual and a qualified installer confirm the correct bracket and mounting.

On a listing, a bracket linear drive may appear as part of a complete pack or as a separate drive unit. The title may say 'linear drive' or name the drive type. Compare listings on the stated drive name. For complete systems, see the complete autopilot packs guide.

Rudder reference and virtual feedback

An autopilot needs to know the rudder or outboard position. A rudder reference unit is a sensor that measures this. Some systems use a physical rudder reference, while others use a virtual method.

Furuno's NavPilot pages describe Fantum Feedback, a software feature that removes the need for a physical rudder feedback unit on outboard installations. The page says this is for outboard and sterndrive boats. This is a stated detail on the maker's page.

If a listing mentions 'no rudder reference required' or 'virtual feedback,' that is a stated detail. If it does not, ask the seller or check the maker's page. The catalogue cannot say which method works better. For Furuno options, see the Furuno autopilot guide.

Comparing complete packs and core packs

When you look at autopilot listings for a single outboard, you will see complete packs and core packs. A complete pack includes the drive, control head, and sensor. A core pack may omit the drive or the control head.

For a single outboard, the drive is the key difference. A complete pack with a hydraulic pump is a direct match for hydraulic steering. A core pack without a drive lets you keep an existing drive, but only if the maker approves it.

Use the site's filters for 'drive in the box' and 'control head in the box' to narrow listings. Compare packs on stated details: drive type, control head model, and sensor included. The complete packs guide and core packs guide list these separately.

What to ask before buying

Before you choose a drive for a single outboard, ask these questions. The answers come from the maker's manual, the seller, or a qualified installer.

First, what steering system does the boat have? Hydraulic, mechanical, or something else. Second, does the autopilot pack include a drive that matches that system? Third, if the pack has no drive, can the existing drive be reused?

Also ask about the rudder reference. Does the system need a physical unit, or does it use a virtual method? The maker's page states this. Finally, ask about the control head: is it in the box or sold separately?

These questions help you compare listings on stated details. The site does not give installation instructions or compatibility claims beyond what the maker states. For control head options, see the autopilot with control head guide.

• What steering system is on the boat?
• Does the pack include a drive that matches?
• Can an existing drive be reused?
• Does the system need a rudder reference unit?
• Is the control head included?

What the catalogue cannot say

The catalogue lists stated details: drive type, pack contents, and model names. It cannot say how a drive performs on the water, how long installation takes, or which drive is more reliable.

It also cannot say if a drive fits a specific boat model. The maker's manual and a qualified installer decide fit. The site makes no claims about course-holding accuracy or behavior in waves.

For safety, an autopilot does not replace a lookout. The U.S. Coast Guard Boating Safety page emphasizes boating safety and education. Keep watch and follow safe boating practices. For powerboat-specific picks, see the powerboat autopilot guide.

What to pick for your situation

Questions

What is the difference between a hydraulic pump and a linear drive for a single outboard?

A hydraulic pump connects to the boat's hydraulic steering system and moves fluid to turn the outboard. A linear drive is a mechanical unit that pushes or pulls a steering link. The choice depends on the steering system aboard.

Can I use a linear drive on a single outboard with hydraulic steering?

A linear drive is typically for mechanical steering. For hydraulic steering, a hydraulic pump is the common match. The maker's page and a qualified installer decide what fits your boat.

Do I need a rudder reference unit for a single outboard autopilot?

Some systems require a physical rudder reference unit. Others, like Furuno's Fantum Feedback, use a virtual method that removes the need for a physical unit. The maker's page states this.

What does 'drive in the box' mean on a listing?

It means the autopilot pack includes a drive unit, such as a hydraulic pump or linear drive. A core pack may omit the drive. Use the filter to compare packs on this stated detail.

Can I keep my existing drive when adding an autopilot to a single outboard?

A core pack without a drive lets you keep an existing drive, but only if the maker approves it. Check the maker's page or ask a qualified installer before ordering.