Position Resolution; Td Settings Menu; Map Datum And Fix Datum; Position Correction - Raytheon RayChart 620 Operation Manual

Electronic charting system
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Position Resolution

When working with position information in latitude and longitude, you
can display any position data to either two or three decimal places.
Alternatively, you can select TD to display all your position information in
Loran TDs.

TD Settings Menu

If you are using a Loran position fixer, set the TD parameters to the
required values.

Map Datum and Fix Datum

The Map Datum is the geodetic datum to which position details are
referenced on the RayChart display.
The Fix Datum is the geodetic datum to which position details received
from the GPS are referenced.

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
2. Use the trackpad to move the cursor until the correct position is
3. Press the DONE soft key to set the correction, or press the CLEAR

Setting Up the Chart Plotter

The PLOTTER option from the Set Up menu allows you to set up your
chart plotter display preferences.
The following table lists the Plotter parameters and their options, shows
the factory default setting, and provides a space for you to make a note
of your new default setting. Each parameter is described in the
following subsections.
ENTER. The chart is displayed.
displayed in the cursor readout box.
soft key to exit without change.
RayChart 620

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