B&G Network GPSplus - Manual (Page 32)

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NAVIGATION WITH GPS PLUS
The NAV key is used to give navigational information from
your present position to a specific waypoint, the "target"
waypoint. The target waypoint could be any waypoint in the
waypoint library or a waypoint that makes up one the legs of
a pre-defined route.
It is necessary to select a waypoint or a route before the
GPSPlus unit can calculate the data. The target waypoint
can be changed at any time so NAV information is available
about any waypoint in the library.
The following navigational information is available when a
target waypoint has been selected:
•
Location of waypoint
•
Waypoint identity (ID)
•
Bearing and distance from present position to
waypoint
•
Course to steer (CTS)
•
Cross track error (XTE)
•
Course over ground (COG)
•
Speed over ground (SOG)
•
Time to go (TTG)
•
Velocity made good (VMG)
•
Estimated time of arrival (ETA)
Bearings can be displayed in degrees with reference to
True or Magnetic North and distances can be displayed in
Nautical Miles, Statute Miles or Kilometres. The calculated
values can be Rhumb Line or Great Circle.
The NAV key is also used to select the direction of the
route, either forwards or reverse. This is the order in which
the waypoints are used.
NOTES: If when a route is selected or when following a
route the display shows the message NAV FAULT, it
means that the target waypoints of the route have been
deleted from the GPSPlus waypoint library. To overcome
this problem either redefine the route or re-enter the deleted
waypoint(s).
When following a route the GPSPlus will continue to display
navigational data after the vessel has passed the final
waypoint. The information will be based on the last waypoint
until another waypoint or route is selected. The displayed
value for cross track error (XTE) is based on an extended
line of the previous track.
When the GPSPlus is used in combination with a Network
PILOT that has NMEA data being supplied to the PILOT
Display via its NMEA interface, the NAV key allows the
GPSPlus to select the PILOT NMEA data for calculation of
the displayed navigational data.
IMPORTANT NOTE: If MARK waypoints have been used to
create a route ensure that the MARK latitude and longitude
is as you expect. If the MARKs have been erased and then
re-entered (by pressing the MARK key) the MARK latitude
and longitude will have changed and the route could be
entirely different. THIS COULD ENDANGER YOU, YOUR
CREW AND YOUR VESSEL. CHECK BEFORE YOU
ENGAGE THE ROUTE.