Raymarine GPS Plotter, Owner'S Handbook Manual

Page: 83 / 131

4-6 Raynav 300 GPS Plotter
Auto Mode
If Auto mode is selected, the value of variation is obtained automatically,
normally from received data. The variation value that is used depends on
the data available, and is selected in the following order of priority:
1. Variation value from the same source as the heading data:
If heading data is being taken from NMEA, then variation is also
taken from NMEA.
If heading is taken from SeaTalk, then SeaTalk variation is used.
2. Variation value from a different source:
If heading data is being taken from NMEA, but no NMEA variation
is available, then variation is taken from SeaTalk.
If heading is taken from SeaTalk, but no SeaTalk variation is avail-
able, then variation is taken from NMEA.
3. A calculated variation value, using position data, if no SeaTalk or
NMEA value is available.
4. The current manual variation value, if no SeaTalk or NMEA value
and no position data is available.
Manual Mode
If
MANUAL
mode is selected, by pressing either of the
MANUAL
soft keys,
the local variation value can be specified according to the area in which
you are operating. Press the appropriate
MANUAL
soft key to adjust the
variation up or down, to a maximum of 30° East or West.
This value is then transmitted to any other SeaTalk instruments on your
system. It is retained if you turn the display off and on again.
In Manual mode, incoming NMEA variation is ignored. However, if the
variation is changed on another SeaTalk instrument, the new value is
used and the manual value that is displayed is updated.
Note:
The Manual variation value defaults to 0°, so it is important to set
up a value if variation is not available from an external source.
NMEA OUT Set Up
Each NMEA sentence can be set to either
OFF
or
ON
individually. The
factory default is
ON
for each sentence.
Cursor Echo
You can set up your system so that radars, plotters and chartplotters
connected via SeaTalk can display each other’s cursors.
81171_4.BOOK Page 6 Thursday, November 29, 2001 11:34 AM