Navitron
Systems Ltd
Off Course Alarm
Type NT925OCA

The Navitron Off Course Alarm type NT925OCA is a fully independent course monitoring device which complies with the articles of IMO resolution A342 (IX).

It can be installed with a single heading input obtained from a Navitron Heading Sensor Coil (type HSC2) or from a proprietary NMEA source (or both) when used as a completely independent system. However, if one of the heading data inputs is common to the heading data provided for an autopilot system (gyro data etc) the second heading input to the NT925OCA must be obtained from an independent (mag compass etc) source.


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Model NT925OCA
Off Course Alarm

Simple to operate, both versions feature: -

NT925OCA / 1 is primarily intended for use as an independently referenced course monitor which, when installed as an independent system or in conjunction with an appropriate Navitron Autopilot system, renders the entire configuration compliant with all articles of IMO Resolution A.342(ix).

Dual Heading input ports are standard and can be connected to accept magnetic information derived from a Navitron heading sensor coil attached above or below an existing ships compass and / or a range of NMEA 0183 heading sentences derived from proprietary sources such as GPS compasses and Gyro’s etc. Whilst only one heading input is essential, dual inputs will provide a back up system where either input maybe chosen as the primary or secondary heading reference.

Standard features include installation programmable Deviation and Variation correction, NMEA 0183 and Step by Step (installation Programmable 3, 6,12 and 24 step/degree) heading outputs for use by proprietary radars etc.

NT925OCA / 2 is designed for use as an independently referenced Off Course Alarm but includes a Course Comparator Alarm which may be enabled or disabled during installation as required.

Unlike the heading sensor coil and single NMEA input associated with the NT925OCA / 1, the NT925OCA / 2 features dual NMEA 0183 heading input ports. Only one input is required for Off Course Alarm operation whilst dual inputs are essential for the additional Course Comparator function which continuously monitors and compares the two sets of NMEA data received. In the event of excessive differences between the data received (trip level installation programmable 1-20°) the alarm is activated.

A Step by Step (installation programmable 3, 6,12 and 24 step/degree) ouput facility is standard.

3 digit course set display
2 digit course error display
3° to 30° OCA trip level
11 - 40 Vdc power supply

Compass Safe Distance - 0.4m

Weight - 1.1Kg

NT925OCA Outline Dims / Mounting Details

Download the NT925OCA Leaflet

Click for the NT925OCA / 1 PDF Manual

Click for the NT925OCA / 2 PDF Manual


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