NorthStar 941X Reference Manual page 87

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distance, bearing
dist/speed units
"
Rev. D
To change any of the options (described below), select it by using the
cursor keys to move the arrow at the left of the screen, and then press the
EDIT menu key. The field will begin to flash, waiting for you to change it
using the up/down cursor keys or the keypad.
The 941X offers you the choice of calculating the distance and bearing to
as
your intended destination as either a GREAT CIRCLE route or a
RHUMB LINE.
The shortest distance between any two points on the surface of a sphere
is called a Great Circle route. It appears as a curved line on a Mercator
chart and is the default method of calculating distance and bearing to
waypoints by the 941X.
Rhumb line navigation maintains a constant true direction to your desti-
nation (seen as a straight line on a Mercator chart), but is a somewhat
longer route to travel over great distances than the Great Circle calcula-
tion. A Rhumb Line course may be desired if a Great Circle route is likely
to take you precipitously close to bad weather or an unavoidable land
mass.
You may choose between nautical miles and knots, kilometers and kilo-
meters per hour, or statute miles and miles per hour, for the 941X's vari-
ous distance and speed displays, respectively.
To change this option, press EDIT, then use the cursor keys to scroll
among the available choices. Press ENTER to make your selection, or
CLEAR to leave the option unchanged.
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