H3000 Pilot Handbook___________________________________________________
HB-3001-02
46
When engaged in NAV
mode the Pilot will steer a course using waypoint
data from the position fixer programmed with the waypoint positions.
It is important to remember that when the Pilot is steering to a waypoint
using NMEA data, any erratic data or positional errors generated by the
position fixer will be transferred to the Pilot via the NMEA interface and
the; instrument system. Position fixer errors can be due to many causes
including: poor reception, bad satellite constellation, radio beacon chain
transitions, local geography and high power transmitters.
Position fixer errors can cause steering inaccuracy. Always maintain a log
and position plot on an up-to-date chart. Remember to check that the Pilot
course (waypoint to waypoint) will steer the boat clear of any obstacles,
taking into account the effects of tide and possible course errors.
Before using the NAV mode steer the boat manually until the XTE
distance is less than 0.03 NM and the heading is close to the waypoint
Bearing (Waypoint Course) as shown on the Pilot Display.
If XTE is more than 0.03 NM when the Pilot is engaged in Steer to
waypoint mode, the course will be altered by up to 30
o
to bring the boat
back onto track.
The Pilot Target will alternate between your bearing to waypoint (BTW)
and cross track error (XTE)
Caution:
Before using NAV mode, check the following points:
The position fixer has a compatible NMEA 0183 interface set-up in
accordance with the manufacturer’s instructions.
The appropriate NMEA sentences are selected and set to be transmitted.
The minimum data requirement is XTE (cross track error); however, XTE
and BTW give the best steering performance. For Pilot operation select
any of the following NMEA sentences: RMB (best option), XTE, APA, or
APB together with BWR or BWC.
The position fixer is switched ON and has the correct current position.
The signal and noise levels are within the manufacturer's recommended
limits.
The waypoints have been entered correctly, and the waypoint arrival
alarm is switched ON.
Summary of Contents for H3000 Pilot
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