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5. SETTING DESTINATION
5-7
5.4 Finding Range and
Bearing Between Two
Points
Selecting course sailing method
The range and bearing to a destination can
be calculated two ways: Great Circle or
Rhumb Line. However, cross track error is
calculated in rhumb line only.
Great Circle: The great circle courseline is
the shortest course between two points on
the surface of the earth. (Imagine stretching a
piece of yarn between two points on the
earth.) However, this course requires
frequent change of heading to follow course
faithfully.
Rhumb Line: The rhumb line courseline is
the straight line drawn between two points on
a nautical chart. This course does not require
frequent changes of heading however it is not
the shortest since it follows the earth's
curvature.
1) Press [MENU ESC], [9] and [1] to display
the PLOTTER SETUP menu.
PLOTTER SETUP
Bearing Ref.
Auto
(07 W)
Man
(00 E)
ENT:Enter
MENU:Escape
Memory Apportion
Mag Variation
True
Trk = 1000 / 2000Pt
Mag
R.L
G.CCalculation
User defined #1 SOG
User defined #2
COG
User defined #3 RNG
User defined #4 BRG
Figure 5-20 PLOTTER SETUP menu
2) Press
or to selection Calculation.
3) Press
or to select R.L (Rhumb
Line) or G.C (Great Circle).
4) Press the [NU/CU ENT] key.
5) Press the [MENU ESC] key.
Calculation procedure
You can find the range and bearing between
two points by two waypoints or two latitude
and longitude positions.
1) Press [MENU ESC] and [5]. The MANUAL
CALCULATION menu appears.
MANUAL CALCULATION
: N/S, E/W
ENT : Calculation
: Cursor
MENU : Escape
Waypoint No.
From
. ’N ’E
To Waypoint No.
. ’N ’E
Trial speed : Auto Man
( kt)
TTG: D H M
Rng: . m Brg: .
Figure 5-19 MANUAL
CALCULATION menu
2) Choose two points by one of the methods
below.
Latitude and longitude positions
1) Press
.
2) If necessary press [
] to switch from
North latitude and to South latitude vice
versa.
3) Key in latitude.
4) If necessary press [
] to switch from West
longitude to East longitude and vice versa.
5) Key in longitude.
6) Press
.
7) Repeat 2-5 to enter other point.
Waypoints
1) Key in first waypoint number (000-999).
(000 is reserved for own ship position.)
2) Press
twice.
3) Key in other waypoint number (000-999).
4) Press
to shift the cursor to the Trial
Speed line.
5) Press
or to select Auto or Man. Auto