Navitron NT777



Overview
Purpose developed for small professional vessel use spanning workboats, pilot and patrol craft, fishing vessels and motor yachts to 25m LOA, the NT777 model is the first of a new digital Autopilot generation designed and manufactured by Navitron Systems Ltd.

Accordingly, the NT777 Autopilot System provides Navitron steering expertise in a robust and compact package based on highly intelligent control and monitoring functions normally only associated with IMO compliant Type Approved models.

Produced and tested in an ISO 9001:2000 environment, standard features include:-

  • Dual NMEA Heading Inputs
  • Mag Sensor Coil Heading Input
  • Multi Waypoint Track Steering
  • Multiple Control Unit Options
  • Integral Off Course Alarm
  • Integral Watch Alarm
  • Custom Turn & Dodge functions
  • NMEA & Furuno Heading Outputs
  • 11-40Vdc Power Supply
  • 11-40Vdc/5A rated solid state switch Outputs to Solenoids

Combined with full PID intelligence, auto rudder stability, Autotrim (APH), integral audible/visual Alarm functions with Reset, the NT777 is equipped for precision performance and reliability.

The Autopilot 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 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 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 Autopilot system can also be used with alternative Distribution Units to provide ± 10Vdc or 4-20mA outputs required to interface with analogue steering machines.

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 Autopilot System can support a maximum of 3 Control Units which connect to a central Distribution Unit.

Model NT777 Distribution Unit.
(Dims 270 x 175 x 66 mm)

Optional Equipment Inputs /Outputs: –
These are available from the standard Distribution Unit and will support a range of equipment and services which include:-

Rudder Angle Indicators
Analague and Digital Heading Repeaters
NMEA Heading Outputs (to Radars etc.)
Navitron & Proprietary Power Steer Controls
Universal relay Box

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Technical Specification

Supply
Voltage
11-40Vdc
Progammable LCD
Display

(75 x 53mm Control Panel Window): –

Actual Heading
° MAG or TRUE
Power
Consumption
12v
24v
Set Course
° MAG or TRUE
Off
4.2W

4.3W

Rudder Angle
Bar Graph and 2 Digit
Standby
4.6W
4.8W
Rudder Control
Setting Value (1 – 9)
On
5.1W
5.3W
Yaw Control
Setting Value (1 – 9)
Illumination
(max)
+1.5W
+1.5W
Counter Control
Setting value (1 – 9)
XTE Track Mode
XTE Amount (nM)
XTE Direction
(Left/Right)
Data Type Update
(every 18secs)
Solenoid
Switch Ratings: –
Voltage
11-40Vdc
Current
5A
(max)
HTS Track Mode
Heading to Waypoint

(xxx.x°)
ErrorValue

(xxx° Left/Right)
Data Type Update
(every 18sec)

Switchline
Polarity
Installation
Selectable

(Common +ve or Common -ve)

Switch
Type
Solid
State
Autopilot Operating Mode Displays
Operator
Controls: –
Standby – Manual Steering
Yaw
Select keypad + illum
Autopilot Steering (On)
Rudder
Select keypad + illum
Auto Track Steering
Counter
Select keypad + illum
Remote Auto Steering (other station on)
Autopilot Mode (Off/Standby & On Keys)
Track
Keypad On/Off
Off Course Alarm
Program. 3-30 °/Off
Autotrim
Keypad Off/Set
Watch Alarm
Program. 3-12 min
Illumination
Variable Red
LED Backlight
Screen Display Alarm Messages:-
Custom Turns:-
33 in total including:-
Dodge/Custom Keypad selectable D.BOX FAIL COMM FAIL
+/- 1 / +/- 5 Deg Keypad selectable SET DAT FAIL TRACK +/- 30
Cancel/Confirm Keypad selectable +7V FAIL STEER’G FAIL
+3.5V FAIL COMPASS FAIL
Heading
Input Sentences from GPS / Mag
Compass etc: –
REMOTE FAIL HDT 1 FAIL
HCC 1 FAIL HDM 1 FAIL

NMEA

0183

MAG
GPS
NO XTE DATA HDG 1 FAIL
NO HTS DATA R.R.U. FAIL
XX HDM XX HDG XX HCC XX HDT
XX
HDT
XX HDM
XX HDG
XX HCC
DATA ERROR CPS.HI FAIL
LIM/SWT OPEN CPS.LOW FAIL
Diagnostic Mode Display Messages
9 Diagnostic Display Sets (step selectable)
XTE
Input Data (from GPS/Plotter etc.): –
NMEA
0180
CTE

Mechanical
NMEA
0183
XX APA, XX APB
XX RMB, XX XTE
Width
192mm
270mm
Height
120mm
175mm
Depth
– (C/U behind bezel)
48.4mm
66mm
Heading to Steer Data (from GPS/Plotter):-
Bezel Depth
14mm

N/A
NMEA 0183
XX HTC, XX HSC,
XX APB
Compass Safe Distance
0.4m
0.4m
Weight
1.2Kg
1.5Kg
Heading
Output to Radars / Track Plotters etc.
1Hz
11Hz
22Hz
NMEA
0183
Sentence types
@ 1, 11 & 22Hz
MAG
APHDG
APHCC
HCHDG
HCHCC

HCHDG
HCHDM

HCHDM
GYRO
HEHDT AGHDT
HEHDT
HEHDT
Furuno
Format
Selectable
0.1° or 0.166° resolution
Selectable
5Vpp or 11Vpp output
Selectable
5Hz or 40Hz update rate

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