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Autopilot PT500/70 Series

Supplier: Yokogawa

An autopilot controls the steering gear of a vessel to keep it on course.


There are two types of control methods. One is called single-loop control and uses torque motors or the like, and the other is called two-loop control which uses solenoid valves or servo-cylinders as actuators. The actuator selection depends on what type of steering gear is used.

PT500: This type is widely applicable to many types of vessels and can be easily adapted to any type of steering gears and actuators.

PT70: This type is suitable to middle size and small vessels which use solenoid valves. It is designed for easy mounting on the consoles of small vessels.

Features of Autopilot PT500 Series:

  • The model PT500 autopilot, which has superior operability and functionality, is suitable for a wide range of applications, from large tankers to small freighters and high speed boats. It is available in two versions, model PT500A and model PT500D, which differ in respect of the method of automatic steering. You can freely select a suitable model and configure the optimum system for the type of vessel concerned.
  • Follow-up and non follow-up steering systems are completely independent. Consequently, an abnormality in one system has no effect on the other system. Also, the control systems of the automatic and manual steering units are independent of each other.
  • The course setter has a dial (25 degrees/rotation), and the set course indicator uses a readily visible red LED. The function keys use easy to understand pictorial characters in order to minimize the possibility of operator error.
  • A separate DIN standard unit is used for each function, facilitating excellent functional expandability and operability. The automatic steering unit, steering repeater compass and other units are of compact design and occupy a volume of about 80% of that of previous units. They can thus be easily incorporated in a console or used to build up a system.

Features of Autopilot PT70 Series

  • Integrates the autopilot system interface and solenoid valve control circuit into the distribution unit, reducing the total space required by the autopilot system.
  • Units are available that meet each ship's specifications and can be easily designed to suit the required system configurations.
  • Functions of each unit are individually divided to realize excellent system development and maintenance functions. The PT70 can be easily mounted on a panel or integrated into the cockpit console bridge.

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