Designed and developed by Navitron Systems Ltd to provide heading data/signal coupling between otherwise incompatible equipment, the Navitron Heading Data Interface range offers simple to install solutions to many heading data and speed log communication problems.

Six models of Heading Data Interface (HDI) are available to convert heading signals sourced from proprietary types of gyro, magnetic and electronic compass - including GPS antenna types - to the signal format(s) required to 'handshake' with a wide range of end users such as Radars, Trackplotters, Autopilots, GPS Receivers and Heading Repeaters. Additionally, three of the models will accept speed log pulse information for conversion to combined NMEA heading and speed data output (VHW sentence) for use by ECDIS and AIS Systems etc.

Input Signal types: -
Heading: -

NMEA 0183
(0.2 - 25Hz) --»

Furuno
(0.2 - 50Hz) --»

Speed: - --»
(200 or 400 pulses
per nautical mile)

Type NT920HDI

Typically for use with electronic compass types
including GPS antenna models and / or
pulse output speed logs

Simultaneous Outputs: -

Navitron Autopilot data

(Not available from version NT920HDI / 2)

Navitron Serial data

Furuno (5Hz or 40Hz)

3, 6, 12, 24 Step/degree

Dual NMEA outputs: -

(Heading only, speed
only or speed & heading)

Type NT921HDI		Type NT922HDI
Input	Sin / Cosine	Input	NMEA 0183 Heading data @ 4800, 9600, 19200 or 38400 baud
Signal:-	(0 - 5Vdc range)	Signal:-

Output Signal:-		Output Signal:-
Single channel NMEA 0183 Heading Data. Installation Selectable 4800 / 38400 baud with 1Hz, 10Hz or 20Hz update rate combinations.		Installation selectable 3, 6, 12 or 24 steps/degree (5Vp/p) & isolated dual channel NMEA Heading data @ 4800, 9600, 19200 or 38400 baud with update rate combinations of 1, 8, 10, 20 and 40Hz
For Sin / Cos compass to NMEA data.		For NMEA to Step & NMEA baud rate conversions

Input Signal: -	Type NT923HDI	Type NT925HDI (See also Gyro Converter Type NT990HDI)	Input Signals: - Synchro ratios: - 1:1, 36:1, 90:1, 180:1 360:1 Step by Step: - 3, 6, 24 steps/degree M-type: - 12 steps/degree Speed Log: - 200 or 400 pulse per nautical mile
Simultaneous Outputs: - Navitron Serial data & Isolated NMEA 0183: - (2 channels at 10Hz) Deviation programmable			Simultaneous Outputs: - Navitron Serial data Isolated Step by Step (3, 6, 12 or 24 steps/deg) 2 x NMEA 0183 Channels (i) Heading (HDT): - Select 1Hz/10Hz/24Hz with ROT(select 1Hz/5Hz) (ii) VHW (1Hz/5Hz) ROT (5Hz) HDT (10Hz) 2 channels Furuno (select 5Hz & 40Hz)
For serial data acquisition from a Magnetic card compass		For multi-data type acquisition from most gyrocompass types combining speed log data if required

Input Signal types: -

Synchro ratios: -
1:1, 36:1, 90:1,
180:1 360:1

Step by Step: -
3, 6, 24 steps/degree

M-type: -
12 steps/degree

Speed Log: -
200 or 400 pulse
per nautical mile

Type NT990HDI

For 4800 bd and 38,400 bd NMEA data acquisition from most gyrocompass types combining speed log data if required

Simultaneous Outputs: -

NT990HDI / 1
(Single NMEA Output)

$HEHDT, $HEROT & $VDVHW in installation selectable 4800 or 38,400 baud combinations

NT990HDI / 2
(Dual NMEA Output)

As above with each channel independently installation selectable