Purpose designed by Navitron Systems Limited for professional use on Magnetic and/or Gyro based commercial vessels of all types to approximately 2000 gross registered tonnes, the Navitron NT921G is a powerfully equipped and technologically advanced Autopilot which is R.M.R.S and Morsviasputnik Type Approved to IMO and ISO specifications.

A Type Approved installation programmable Autopilot for Mag and/or Gyro based vessels from 18m to approximately 2000 gross registered tonnes.

• Dual Mag Inputs: Sensor Coil and/or NMEA
• Dual Gyro Inputs: 1:1 Synchro and/or NMEA
• Built in RadioNav: Track steer via GPS / Plotter
• Off Course Alarm
• Automatic Stability: Monitors Rudder speed
• 3 x Heading Outputs: NMEA, Step by Step and Furuno formats

Typical Applications

• Deep water Fishing Vessels and Workboats
• Coasters, Dredgers, Survey and Support Units
• Tugs
• Ferries
• Military Craft

Fully programmable to provide optimum installation flexibility and final seagoing performance, the NT921G Autopilot is also simple to operate via a clearly defined ‘push and rotate’ Heading selector supplemented by +1°/-1° keys for fine course adjustment use when appropriate.

Track steering based on Cross Track Error (XTE) data received from the ships GPS system is also a standard feature providing automatically corrected direction over the ground between predetermined waypoints.

The control unit is suitable for console or bracket mounting in bridge or wheelhouse locations. Standard system supply also comprises a Mag Heading Sensor Coil and Rudder Reference Unit for installation to low voltage solenoid operated (11-40Vdc max) hydraulic steering systems.

High voltage solenoids (110/220Vac/dc) can also be accommodated via the inclusion of an optional Universal Relay Box type NT920URB.

A second Mag input facility is provided to accept NMEA heading data from a proprietary source and dual Gyro input ports are standard to accept NMEA and/or 1:1 isolated Synchro heading data.

Where Step by Step, M-type or non 1:1 Synchro ratios are involved, a Fully Type Approved Gyro interface (type NT925HDI) is available. Similarly, fully Type Approved Analogue and Dual Steering Interfaces are available for Azimuth propulsion units and Dual rudder systems respectively. (See Interface types NT990ASI and NT990DSI)

Standard Features

• Full P.I.D Intelligence
• Servo driven Heading Repeater (Standby mode)
• Dual Course Setting and Steer on Lock on facility
• Full Automatic Permanent Helm (Automatic Trim)
• Heading, Rudder angle and Track data displays
• Programmable Rate of Turn
• Automatic Rudder stabilisation compatible with dual speed steering systems
• Operator variable control panel illumination
• 11-40Vdc Power Supply compatibility
• Solid State Output stages (11-40Vdc / 5A Max)