Navman Tracker 5507 Installation And Operation Manual page 52

NMEA datum offset
If you select a map datum other than WGS 84,
the map datum offset can be applied to latitude
and longitude coordinates sent on the 5507/5607
NMEA output:
Latitude and longitude coordinates
displayed on any NMEA repeater do not
match the coordinates on the 5507/5607.
Latitude and longitude coordinates
broadcast on any NMEA VHF transmitter will
be the same as the coordinates on a WGS 84
chart.
Latitude and longitude coordinates
displayed on any NMEA repeaters match
the coordinates on the 5507/5607. However,
latitude and longitude coordinates broadcast
on any NMEA VHF transmitter will be slightly
offset from coordinates on a WGS 84 chart.
CAUTION
!
Map shift
WARNING
!
Map shift is for eliminating minor offsets.
DANGER
It should not be used if the correct datum
is available. Use map shift with caution:
incorrect application will cause incorrect
CAUTION
boat positions.
Some charts have consistent position errors.
To correct this, apply a map shift. After a
map shift:
52
NAVMAN TRACKER 5507/5607 Installation and Operation Manual
The positions of cartographic features (such
as land, rocks, buoys and depth contours)
move on the 5507/5607 chart window to
where they should be.
The positions of the boat, waypoints, tracks,
and lines of latitude and longitude on the
5507/5607 chart window remain unchanged.
Applying a map shift
1 Move the boat to a known point on the chart,
for example a marina berth.
In the Chart setup menu, select Map
2
shift .
3 Move the cursor to the position on the chart
where the boat actually is.
and select Set.
4 Press
5 Press to set the new map shift. The
boat will now be displayed at its actual
location.
Clearing the map shift
Clearing the map shift removes any map shift
from the cartographic features on the 5507/5607
chart window.
In the Chart setup menu, select Map
1
shift.
2 Press and select Clear.
3 Press .