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JLR-7700 MK2 GPS Navigator
4.5.3.5 Switching between Great-circle and Rhumb-line
The following two types of navigation calculation methods can be adoped with the equipment, which should
be selected depending on the application.
・ Great circle
・ Rhumb line
The characteristics of the great circle and rhumb line
The vessel can navigate by the shortest possible distance from the current position to the destination with
the great circle. However, the steersman find the bearing which continuously changes as the vessel
navigates, which differs from the bearing obtained with the ordinary chart.
The vessel can navigate without changing the bearing from the current position to the destination with the
rhumb line. The rhumb line bearing coincides with the line obtained by connecting the current position and
destination on the ordinary chart.
In general, the great circle is often used for the long route plans and the other for relatively short route plans.
The navigation mode can be switched between the great circle and rhumb line as described below.
Press the key provided on the right hand side of the NAV. CALCU. on the ROUTE SEQUENCE screen
to select either one of the two.
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