Instruction manual

WP32 Wheelpilot
32
E04596
6.3 NMEA sentences received
The NMEA0183 information required for full functionality
whilst in Nav Mode is as follows:
- Cross Track Error
- Bearing to destination waypoint
- Arrival at waypoint indication
- Magnetic Variation
- Boat Speed
This information is extracted from the following NMEA0183
sentences:
Received Data
APA Cross Track Error, bearing to/arrival at waypoint
APB Cross Track Error, bearing to/arrival at waypoint
RMA Speed & course over ground & magnetic variation
RMB Cross Track Error, bearing to/arrival at waypoint (T)
RMC Speed & course over ground & magnetic variation
BWR Bearing to/arrival at waypoint (rhumb line)
BWC Bearing to/arrival at waypoint (great circle)
VHW Boat Speed
XTE Cross Track Error
NOTE The Cross Track Error (XTE) information has a maximum
value of 1.2 Nautical Miles. If the XTE exceeds this while using
Nav Mode, the Wheelpilot will sound an alarm, exit Nav mode
and return to Compass Auto mode.
The Wheelpilot also extracts the apparent wind angle from the
following NMEA0183 sentences:
Received Data
VWR Apparent Wind Speed & Angle
MWV Apparent Wind Speed & Angle
6.4 Adjusting belt tension
The belt tension is set when the Wheelpilot is assembled; how-
ever, it may be necessary to adjust this during the lifetime of
the pilot.
The tension is adjusted by means of a screw situated under-
neath the clutch lever (Fig 6.1). This screw is only accessible
when the lever is in the up (disengaged) position. To decrease
the clutch tension, turn the screw clockwise. To increase the
tension, turn the screw anticlockwise. The scale next to the
screw indicates the current tension setting. When the pointer is
at the top, the clutch is at maximum tension. Minimum tension
is indicated when the pointer is at the bottom.
Fig 6.1 - Belt tensioner
Indicator pointer
Adjusting screw
Scale