Raymarine L1250DRC, Owner'S Handbook Manual

Page: 98 / 246

4-20 HD Series Fishfinders
R
adar/Ch
art S
ync
h
Radar/Chart Synch
Note: This option is only available in Radar mode if your system includes a ra-
dar display.
If you have an hsb
2
Plus Series combined Fishfinder/Chartplotter display
connected via hsb
2
to a Pathfinder Plus Series Radar display, you can select
Radar/Chart Synch
ON
or
OFF
. When set
ON
with chart and radar windows
displayed,
FIND SHIP
can be used to synchronize the radar and chart images.
The chart is redrawn so that its center matches that of the radar display. The
radar is redrawn to the scale and heading mode of the chart.
Datum Selection
You can select either
WGS 84
or
LOCAL
datum. In
LOCAL
mode, you are
presented with a list of datums. Use the trackpad to scroll through the list, then
press
ENTER
to select the option and close the menu.
When you change datum selection, the system attempts to set any connected
GPS to the new mode, using SeaTalk and NMEA set up commands. A
message shows whether the set up was successful or not.
WARNING:
Changing the chart datum does not cause any waypoint or routes stored
in the chartplotter to move. Waypoints and routes may therefore appear
to be at different positions when you change the datum.
When adding waypoints numerically to the waypoint list, or via SeaTalk,
hsb
2
, or NMEA, it is important that they are referenced to the same
datum that the chart is to be operated in.
Position Offset
You can offset the vessel position to allow for differences between the GPS
and paper chart data. This may be useful if you are using a datum that is not
available on the Chartplotter, or if you are referring to a paper chart drawn to
unknown datum.
You can change the offset by moving the cursor to the known vessel position.
This offset is applied to all incoming position data. The default offset value is
zero.
When position offset is switched on, all displayed vessel position data is
annotated
(C)
to indicate it has been corrected.
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