TMQ Bosun-AP9, Operation And Installation Manual

Page: 13 / 63

TMQ Bosun - AP9 Rev1 (935) Page 13 16/06/2003
Setting up your GPS unit
Because there are a great variety of GPS units that will work with
this autopilot, the following is a guide only. For more information,
consult your GPS manual.
The GPS unit must be set up to output "NMEA 0183" data on a pair
of wires which are connected to the
GPS In terminal connections
inside the Bosun . The data generated must include at least one of
the following:
•
The APA sentence.
•
The APB sentence.
•
The BOD and XTE sentences.
If only the XTE data sentence is available, the pilot can steer in a
restricted manner. See later in this section.
The GPS unit must then be commanded to go to a waypoint, or to
follow a line joining two or more waypoints (called a
route ).
This unit will then send information to the autopilot from which can
be calculated the
course-to-steer . If several waypoints are linked
together into a single route, and the GPS unit is set to "auto-
sequence" between them, and an "arrival zone" of more than 0.1 NM
(Nautical Miles) is set so that the GPS can detect when the vessel
has reached a waypoint, then the Bosun will be able to steer from
each waypoint to the next without intervention.
If only the XTE information is available from your GPS unit then
your vessel must be on track , and heading in the correct direction
before engaging the GPS mode, and the auto-sequencing feature is
not available.