Heading; Magnetic Variation; Position Resolution; Td Settings Menu - Raymarine RayChart 630 Owner's Handbook Manual

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Heading

Select either degrees magnetic or degrees true for your heading data. The units
you set will be used to display all heading data, including information received
from other instruments on the system.

Magnetic Variation

The default setting for magnetic variation is Automatic, which means that the
variation value is computed from a world magnetic model for the year and
current position of the boat.
If no position is available, you can set a specific variation value. Use the
trackpad to change from Automatic to a value, and increase or decrease the
value in 0.1° steps. Press and hold the trackpad to change the value quickly.

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.
The chartplotter allows you to select the following GRI numbers for active
Loran chains:
GRI GRI GRI
GRI GRI
4990
5930
5970
5990
7170
7930
7960
7970
7980
7990
8970
Chain Chain Chain
Chain Chain
Central Pacific (Obselete)
Canadian East Coast
Commando Lion (Korea) (Obselete)
Canadian West Coast
Saudi Arabia South (Obselete)
Labrador Sea (Obselete)
Gulf of Alaska
Norwegian Sea (Obselete)
Southeast US
Mediterranean Sea
Great Lakes
RayChart 620 and 630