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Tritech International Ltd Intelligent Gyro Compass
5.2 Intelligent Fibre-optic Gyro (iFG):
This is a solid-state single-axis fibre-optic gyro (FOG) sensor system that measures rate of turn to a
high degree of accuracy, and with very low drift-rate. This sensor when coupled with an iGC provides a
magnetic-north referenced fibre-optic stabilised gyro system with a drift rate of ~1º heading per hour.
The combination of an iGC and iFG can be used to replace traditional spinning mass gyrocompasses
with a more reliable solid-state solution with significantly better drift-rate performance. The effects of
extraneous magnetic fields is also much reduced with the iGC / iFG combination.
5.3 Intelligent Interface PCB (iIF):
For systems where an RS232 or RS485 sensor output is not compatible with the existing heading
sensor interface, Tritech have developed a number of interface PCBs that can be used to convert the
digital telemetry signals from the iGC and iFG into a compatible format. These PCBs are installed in
the host system in place of the existing heading sensor interface PCB, and emulate the original sensor
outputs (e.g. synchro, analogue, digital etc.) but use the iGC / iFG as the data source.
These PCBs offer a simple ‘hardware’ upgrade to existing systems, without the requirement to rewrite
control system software or redesign hardware. They also offer additional capabilities over existing
systems, such as the ability to receive data from a North-seeking gyro and convert to the host format,
output of pitch and roll signals in the host system’s correct format, automatic selection of the ‘best’
heading source and improved autoheading / turns counter interfaces.
At the time of writing this manual, the following iIF PCBs are available:

Ametek Straza / Perry Tritech Scorpio ROV

Perry Tritech Super Scorpio ROV

Subsea 7 (Subsea Offshore) Pioneer ROV
Tritech are continually expanding the range of supported systems, so please contact Tritech if you
have requirements that are not covered by the list above.
Refer to the ‘Typical Applications’ drawings below for details of some of the possible configurations that
the iGC product family can be used in.
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