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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 NT951G is a powerfully equipped and technologically advanced Autopilot which is ‘wheelmarked’ in accordance with MED 96/98/EC and Fully Type Approved to latest IMO and ISO specifications.
A fully Type Approved installation programmable Autopilot for Mag and/or Gyro based vessels from 18m to approximately 2000 gross registered tonnes.
Fully programmable to provide optimum installation flexibility and final seagoing performance, the NT951G 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.
Programmable Rate of Turn (ROT) allows the maximum safe ROT to be stored in memory at installation and is operator variable during normal operation up to the maximum safe level stored.
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 / 5A 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)
Optional Equipment
| Parameter | Specification |
| Supply Voltage Range | $11\text{V DC}$ to $40\text{V DC}$ (Main power supply with built-in power failure monitoring) |
| Power Consumption | $2.5\text{W}$ @ $24\text{V DC}$ ($8.1\text{W}$ max with maximum illumination) |
| Solenoid Drive Outputs | Solid-state FET switching outputs ($11\text{–}40\text{V DC}$, $5\text{A}$ max continuous rating) |
| Switching Polarity | Selectable Common $+VE$ or $-VE$ |
| Optional Drive Interfaces | Dual solenoid or dual-channel analogue outputs ($\pm 10\text{V DC}$) for independent dual rudder and analogue steering control |
| Display Panel | Servo-driven analogue heading repeater for standby mode, red illuminated control panel, digital heading/ROT display, and bargraph rudder angle display |
| Interface Type | Supported Protocol / Signal | Resolution |
| Mag Heading Input 1 | Direct Navitron Sensor Coil (HSC1 or HSC2) mounted to magnetic compass |
$0.25^\circ$ |
| Mag Heading Input 2 | NMEA 0183 ($xxHDM, $xxHDG, $xxHCC, $xxHDT) |
$0.1^\circ$ |
| Gyro Heading Input 1 | Isolated 1:1 Synchro (with $400\text{Hz}$ excitation from autopilot) | $0.25^\circ$ |
| Gyro Heading Input 2 | NMEA 0183 ($xxHDT, $xxHDM, $xxHDG, $xxHCC) |
$0.1^\circ$ |
| Track Steering Input | NMEA 0183 ($xxHTC, $xxHSC, $xxAPB) via Plotter / ECDIS |
— |
| Follow-Up Rate | Minimum $30^\circ/\text{sec}$ for all heading input types | — |
| Output Type | Configurable Formats & Sentences |
| NMEA 0183 Output |
Isolated RS-422 interface • Heading: • Status / VDR: • Selectable Update Rates: $1\text{Hz}$, $10\text{Hz}$, or $20\text{Hz}$ |
| Furuno Format | Selectable $5\text{Hz}$ or $40\text{Hz}$ update rate ($0.166^\circ$ or $0.1^\circ$ resolution, $5\text{V}$/$12\text{V DC}$) |
| Step-by-Step | Selectable $3$, $6$, $12$, or $24$ steps per degree ($5\text{V DC}$ signal amplitude) |
| Navitron Serial Data | Dedicated data line to Navitron digital repeaters / remote displays |
| Parameter | Specification |
| Steering Intelligence | Full P.I.D. steering algorithm with AutoTrim (automatic permanent helm) |
| Steering Modes | AUTO (Heading Hold), STBY (Manual Helm), TRACK (ECDIS / Plotter Waypoint Steering), DODGE |
| Operator Controls | Rotary Course Setter (Push & Rotate with $+1^\circ/-1^\circ$ fine keys), Yaw, Rudder Mode, Counter Rudder, Rudder Limit, Turn Rate (ROT), Illumination, Mode & Gyro/Mag Selectors |
| Automatic Stability | Automatic compensation for rudder speed variations (compatible with two-speed steering systems) |
| Panel Alarms | Power Fail, Off-Course, Steering System Fail, Rudder Limit, Heading Input Fail, Turn Rate Limit (includes Alarm Test facility) |
| Rudder Feedback Unit | Heavy-duty potentiometric reference unit (NT920RTU / NT990RTU) |
| Parameter | Specification |
| Control Unit Dimensions | $297\text{ mm (W)} \times 176\text{ mm (H)} \times 110\text{ mm (D)}$ (behind bezel) |
| Weight | Approx. $3.3\text{ kg}$ |
| Operating Temperature | $-20^\circ\text{C}$ to $+60^\circ\text{C}$ |
| Compass Safe Distance | $0.6\text{ m}$ |
| Standard Scope of Supply | NT951G Control Unit, Mag Heading Sensor Coil, and Rudder Reference Unit |
Manufacturer Part Number: NT951G
Country of Origin: United Kingdom (UK)
MED Approval: Wheelmarked under MED 96/98/EC
Target Vessels: Commercial vessels (fishing, tugs, coasters, dredgers, ferries) up to approximately $2,000\text{ GRT}$
Standards Compliance: Fully Type Approved to ISO 11674, IMO A.342(IX), and MSC 64/67 Annex 3 (Notified Body 0191/05)
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