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Developed for small professional vessel use spanning workboats, pilot and patrol craft, fishing vessels and motor yachts to 25m LOA, the NT777 MK2 model is a new digital Autopilot generation designed and manufactured by Navitron Systems Ltd.
A high performance multi microprocessor based Autopilot for magnetic/GPS compass and Track steered vessels from typically 10 – 25m (30 – 80ft).
Comprehensively equipped yet simple to operate – and suitable for hull forms from conventional displacement to fast planing vessels – the NT777 MK2 Autopilot System can support a maximum of 3 Control Units which connect to a central Distribution Unit.
Combined with full PID intelligence, auto rudder stability, Autotrim (APH), integral audible/visual Alarm functions with Reset, the NT777 MK2 is equipped for precision performance and reliability.
The 4.3″ Colour Display may be presented in positive or negative mode as preferred (Set Up Menu Installation Selectable).
Automatic display graphic change occurs when Track Steering Mode is selected and includes regular performance and source data updates.
In addition to Track data, the NT777 MK2 will also accept NMEA heading data directly from GPS compass systems etc.
When multi Heading Inputs are employed (NMEA + Mag sensor coil) the priority source is installation programmable with automatic changeover in the event of primary source failure.
Suitable for console or bracket mounting, the NT777 MK2 Control Unit can be externally located and the overall system is normally supplied complete with Heading Sensor Coil (HSC2) and Rudder Reference Unit (NT920RRU) for installation to solenoid hydraulic systems (11-40Vdc/5A max).
High voltage solenoids (110/220Vac/dc) can also be accommodated via the inclusion of an optional Universal Relay Box.
The NT777 MK2 Autopilot system can also be used with alternative Distribution Units to provide ± 10Vdc or 4-20mA outputs required to interface with analogue steering machines.
Optional Equipment Inputs /Outputs
Standard Features
| Parameter | Specification |
| Operating Voltage | 11V DC to 40V DC (Single main supply with internal power monitoring) |
| Power Consumption | Approx. 2.5W (0.2A @ 12V DC / 0.1A @ 24V DC) |
| Drive Outputs | Solid-state dual polarity outputs (+/- 11–40V DC) or potential-free dry contact relays |
| Solenoid Drive Current | Max. 5A continuous output |
| Optional Drive Modules | Compatible with Navitron Galvanic Isolated Drive Cards (for proportional valves / hydraulic pumps) |
| Display Panel | High-contrast backlit graphic LCD display with variable LED dimming |
| Interface Type | Supported Protocol / Signal |
| Magnetic Compass Input | Direct coil sensor (NT920HSC Sensor Coil) or NMEA 0183 fluxgate |
| Gyro / Sat-Compass Input | NMEA 0183 ($HEHDT, $THS, $HCHDT, $INHDT) via RS-422 interface |
| Navigation Input | NMEA 0183 ($APB, $XTE, $RMB) for GPS/Plotter Track Steering |
| Heading Output Data | NMEA 0183 ($HDT, $HDM) output sentence for radar/repeater integration |
| Rudder Feedback Input | Potentiometric reference unit (NT920RTU / NT990RTU) |
| Parameter | Specification |
| Steering Control Modes | AUTO (Heading Hold), STBY (Manual Helm), TRACK (GPS Waypoint Steering), DODGE |
| Rudder Limit Range | Adjustable software limits ($\pm 5^\circ$ to $\pm 40^\circ$) |
| Yaw / Deadband Control | Adjustable sensitivity levels (1 to 10) to adapt to sea conditions |
| Rudder Ratio / Counter | Fine-tune rudder response rate and counter-rudder application |
| Off-Course Alarm | Visual and audible warning with configurable threshold ($1^\circ$ to $30^\circ$) |
| System Diagnostics | Continuous self-test monitoring (Heading Loss, Power Fail, Rudder Fail) |
| Parameter | Specification |
| Operating Temperature | $-15^\circ\text{C}$ to $+55^\circ\text{C}$ |
| Storage Temperature | $-25^\circ\text{C}$ to $+70^\circ\text{C}$ |
| Protection Rating | IP67 (Front panel when flush console mounted) |
| Enclosure Construction | Ruggedized cast aluminum chassis with tactile rubber keypad |
| Mounting Type | Flush panel mount or trunnion mounting bracket |
| Dimensions (Control Unit) | $160\text{ mm (W)} \times 110\text{ mm (H)} \times 45\text{ mm (D)}$ |
Manufacturer Part Number: NT777-MK2
Country of Origin: United Kingdom (UK)
IMO Compliance: Complies with relevant ISO/IMO standards for heading control on non-SOLAS commercial craft, workboats, and high-speed craft.
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