ComNav 1101 Autopilot
the waypoint. The same alarm will occur if the vessel crosses a
line perpendicular to the track at the waypoint. Waypoint arrival
status can be taken from APB (recommended), APA, RMA
together with RMB, or RMB together with RMC. Note that not
all navigation devices send waypoint arrival status.
Furthermore, navigation devices that are capable of sending
waypoint arrival status may not do so all the time, depending on
how they are configured.
Some navigation devices allow you to choose exactly which sen-
tences the device will transmit. Others allow you to select groups of
sentences. For some devices, the number and type of sentences
are not adjustable. Consult the navigation devices manual to
determine what options are available for your particular navigation
device. There is no harm in transmitting more sentences than
those listed above; they will simply be ignored by the autopilot.
However, if too many sentences are transmitted at too fast of a rate,
the navigation device may truncate the number of sentences, and
the autopilot may not get all the information it needs. In this case,
it will sound an alarm and display No Data From Nav Device or
No Speed Error.
ADVANCED OPERATIONS 7 - 2
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