Map Datum And Fix Datum; Position Correction; Head Up Response - Raymarine RayChart 630 Owner's Handbook Manual

Chapter 6: Customizing the Chartplotter
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Note: Obselete chains do not transmit, but allow old TD positions to be
entered.

Map Datum and Fix Datum

The Map Datum is the geodetic datum to which position details are referenced
on the chartplotter display. You can select a datum to match paper charts that
you are using.
The Fix Datum is the geodetic datum to which position details received from
the GPS are referenced. You should select the same datum as your GPS uses.

Position Correction

If the displayed position does not agree with your known position, and you
cannot correct it by selecting the appropriate map datum or fix datum, you can
apply a position correction. The value of the current correction is displayed on
this menu.
To apply a position correction:
1. Move the selection bar to the Position Correction option and press ENTER.
The chart is displayed.
2. Use the trackpad to move the cursor until the correct position is displayed in
the cursor readout box.
3. Press the DONE soft key to set the correction, press NONE to remove a
previously set correction, or press the CLEAR soft key to exit without
change.

Head Up Response

The Head Up Response controls the damping of the chart rotation when Head
Up mode is selected.
The default value is +/-15°, which means that the chart will only be rotated, and
the screen redrawn, if your vessel's heading has changed by more than 15° in
either direction from the current head up display. Select +/-10 for a more
frequent response, or +/-20 for a less frequent response.
Saudi Arabia North (Obselete)
US West Coast
Northeast US
North West Pacific (Obselete)
Icelandic (Obselete)
North Pacific
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