Simrad vs Garmin Autopilots: Which to Choose

What Simrad and Garmin autopilots offer

Simrad and Garmin are two of the most common names in marine autopilots. Both brands sell complete packs, core packs, and individual components, and both support NMEA 2000 networking. The key difference is how each brand integrates with its own ecosystem of chartplotters, instruments, and sensors.

Simrad autopilots, such as the NAC-3 and AC-42, are designed to work with Simrad's own systems and also with B&G and Lowrance equipment, since they share a common platform. Garmin autopilots, like the Reactor 40, are built to integrate with Garmin chartplotters and sensors, using Garmin's proprietary network alongside NMEA 2000.

Networking and compatibility with your boat

Both Simrad and Garmin autopilots use NMEA 2000 for data sharing, which is a standard for connecting marine electronics. NMEA 2000 allows devices from different manufacturers to share data like heading, GPS position, and waypoints. However, each brand also has its own proprietary network: Simrad uses SimNet, and Garmin uses Garmin's Marine Network.

If your boat already has a Garmin chartplotter, a Garmin autopilot will connect directly to that network, allowing you to control the autopilot from the chartplotter and share data without extra gateways. Similarly, if you have Simrad or B&G instruments, a Simrad autopilot will integrate seamlessly. If you have a mix of brands, you may need a gateway to translate between networks, but NMEA 2000 remains the common language.

For more on how autopilots connect to chartplotters, see autopilot integration with chartplotters.

Control heads and displays

Both brands offer dedicated control heads. Simrad's AP44 and AP70 are common, while Garmin offers the GHC 50. These control heads provide a physical interface for engaging the autopilot, adjusting heading, and accessing menus. Some packs include a control head, while others are core packs that require you to use an existing chartplotter or buy a head separately.

When comparing, check whether the pack includes a control head. If you already have a compatible chartplotter, you might save money with a core pack and use the chartplotter as the display. If you want a dedicated helm station, a complete pack with a control head is simpler.

For more on control head options, see autopilot control head options.

Drives and steering types

Both Simrad and Garmin offer drives for different steering systems: hydraulic pumps for hydraulic steering, linear drives for mechanical steering, and rotary drives for wheel steering. The drive must match your boat's steering type. For example, a hydraulic steering system requires a hydraulic pump drive, while a cable-steered boat needs a linear or rotary drive.

Simrad and Garmin both list the drive type in the pack name, such as 'Simrad AP44 Hydraulic' or 'Garmin Reactor 40 Hydraulic.' Always verify that the drive matches your steering system before ordering. If you are unsure, consult your boat's manual or a dealer.

For a detailed explanation of drive types, see autopilot drive types explained.

Sensors and heading sources

Both brands require a heading sensor to determine the boat's direction. Simrad uses the Precision-9 or similar compass, while Garmin uses the GHC 20 or the built-in sensor in the Reactor 40. Some packs include the sensor, while others require you to purchase it separately.

Check whether the pack includes a heading sensor. If not, you may need to add one, which affects the total cost. Also, consider whether the sensor is compatible with your existing network. For example, a Garmin sensor may not work with a Simrad system without a gateway.

For more on sensor requirements, see autopilot sensor requirements.

Complete packs vs. core packs

Both brands offer complete packs that include the control head, drive, sensor, and cables, as well as core packs that omit the drive or control head. A complete pack is ready to install out of the box, while a core pack is for boaters who already have a compatible drive or control head.

If you are replacing an existing autopilot and keeping the drive, a core pack might be more economical. If you are starting from scratch, a complete pack ensures all components are matched. Compare the contents of each pack to see what is included.

For a deeper comparison, see autopilot core pack vs complete pack.

Integration with your existing systems

The biggest factor in choosing between Simrad and Garmin is your existing electronics. If you already have a Garmin chartplotter, radar, or instruments, a Garmin autopilot will integrate with minimal effort. Similarly, if you have Simrad or B&G gear, Simrad is the natural choice.

If you have a mixed-brand helm, NMEA 2000 allows basic data sharing, but advanced features like route following or wind mode may require the same brand. Check the maker's page for compatibility details.

For more on brand compatibility, see autopilot brand compatibility.

What to check before buying

Before choosing between Simrad and Garmin, make a list of your boat's steering type, existing electronics, and whether you want a dedicated control head. Then compare the stated details of each pack: drive type, included components, and network compatibility.

Also consider the installation. Both brands require professional installation for best results, and the maker's manual will guide the installer. Ask your dealer about installation requirements and warranty coverage.

For a step-by-step approach to choosing, see autopilot brand comparison.

What to pick for your situation

Questions

Can I use a Garmin autopilot with a Simrad chartplotter?

Yes, but only through NMEA 2000 for basic data sharing. Advanced features may not work across brands. Check the maker's compatibility page.

Do Simrad and Garmin autopilots include a heading sensor?

Some packs include a sensor, others do not. Check the pack contents. If not included, you may need to buy one separately.

Which brand is better for a sailboat?

Both offer sailboat-specific features like wind mode. Choose based on your existing electronics and the drive type that matches your steering.

Can I install a Simrad or Garmin autopilot myself?

Installation should be done by a qualified installer following the maker's manual. Incorrect installation can affect performance and warranty.

Do both brands support NMEA 2000?

Yes, both use NMEA 2000 for data sharing, but they also have proprietary networks for deeper integration with their own products.