Systems Ltd
Autopilot Type NT990G
Russian Maritime Register of Shipping Type Approved to
IMO A342(IX) as amended by MSC 64/67 Annex 3

Purpose designed by Navitron Systems Limited for professionally operated ocean going commercial vessels of all types from typically 2000 to 20,000 gross registered tonnes, the Navitron NT990G is a powerfully equipped and technologically advanced Autopilot which is R.M.R.S and Morsviasputnik Type Approved to latest IMO and ISO specifications.

Click here for a larger image 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 Channel Heading Outputs: -
NMEA, Step by Step and Furuno formats.

Model NT990G: -

A fully Type Approved installation programmable Autopilot for Gyro based vessels from 2000 to approximately 20,000 gross registered tonnes.

Typical Applications: -

Tankers Passenger Vessels

Cargo Carriers Car Ferries

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).

Optional Equipment : -

Rudder Indicators,
Power Steer Controls,
Digital and Analogue Heading Repeater,
Watch Alarm,
Universal Relay Box,
Analogue Steering Interface,
Dual Steering Interface,
Bow Thruster Interface.

Technical Specifications

Outline & Mounting Details

NT990G Leaflet Download (PDF)

Click for the NT990G Inst/Tech Manual

Click for the NT990G Operating Manual


Fully programmable to provide optimum installation flexibility and final seagoing performance commensurate with the turn rates and inertia levels of larger vessels, the NT990G Autopilot is also simple to operate via a traditionally marked rotary Heading selector backed up by CANCEL and CONFIRM keys to preclude accidental course changes as required by Type Approval regulations.

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) hydraulic steering systems. An optional high voltage (110/220Vac/dc) is also available.

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)

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