The GPS unit must be set up to output “NMEA 0183” data on a
pair of wires, which are connected to the AP46 unit. 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 only. (See later in this section.**)
The GPS unit must be programmed and activated to navigate to a
waypoint, or to follow a line joining two or more waypoints (called a
route). This unit should then send information to the autopilot from
which can be calculated the course-to-steer.
Under the following conditions:
•
Several waypoints are linked together into a single route,
•
The GPS unit is set and capable of “auto-sequence” between them,
•
An “arrival zone” of more than 0.05 NM (Nautical Miles) is set so
that the GPS can detect when the vessel has reached a waypoint.
Then the AP46 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 unit. The “auto sequence” feature is not
available in this instance.
Remember:
Prior to engaging GPS mode, a route or destination must be programmed
and selected in the GPS for the Autopilot to follow.
TMQ AP46 Autopilot
Page 12 of 34
Ver1.0 07/03/2007
