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Magellan MAP 410 GPS Receiver 57
Each Loran chain consists of one master station (designated as M) and two
or more secondary stations (W, X, Y and Z). The user determines which two
secondary stations will provide the most accurate position based on the
angle of intersection of the LOPs.
When TD is selected in SETUP (under COORD SYS) you will be asked to
input the following:
1. The GRI (also called the chain) that you will be navigating in.
2. The two secondary stations that will provide you with the best angle of
LOP intersections. If you have used Loran in the past, you should
simply enter the values you used before.
Other Coordinate Systems. OSGB coordinates are similar to UTMs, but
describe only Great Britain. They must be used with the GBR36 datum. This
coordinate system cannot be used in any other part of the world. The MAP
410 automatically selects the GBR36 datum when the OSGB coordinate
system is selected in Setup. (While OSGB coordinates must be used with the
GBR36 datum, the GBR36 datum can be used with LAT/LON coordinates;
just be sure the map you are using uses both LAT/LON and GBR36.)
If you select OSGB in the COORD SYS portion of the SETUP MENU,
be sure to change the map datum back to the one you will be using
(WGS84 is the default) when changing to another coordinate system.