Mechanical Drive Units

Mechanical Drive Units

Helm drives and linear rams are used to add autopilot capabilities to vessels with mechanical (non-hydraulic) steering systems.

  • Electronic helm drive units suit smaller cable-steered runabouts.
  • Linear rams operate rudders on power-driven boats, or steering quadrants on sailing vessels.


Helm drives and smaller rams work with a standard NAC-2 autopilot computer; more powerful rams for larger vessels are driven by a high-current NAC-3 autopilot computer.

DD15 Drive Unit

Efficient, robust and compact direct drive autopilot unit for sailboats between 30-40ft.