Simrad AP70 Operation Manual page 26

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The NAV mode info panel
A. DTW: Distance to next waypoint
B. WPT: Waypoint name
C. XTD: Cross Track Distance
D. Vessel position relative to leg line
E. CTS: Course to steer (set heading calculated by the autopilot)
F. BWW: Bearing to next waypoint
G. COG: Course over ground
H. SOG: Speed over ground
- If SOG is missing, the speed info will be taken from log (STW). Speed can also be set
manually from the Quick menu (MAN)
The waypoint arrival circle
The arrival circle defi nes the point at which a turn is initiated when you are navigating a route.
The arrival circle should be adjusted according to boat speed. The higher the speed, the wider
the circle. The intention is to make the autopilot start the heading change in due time to
make a smooth turn onto the next leg.
The arrival circle is set in your chart system.
The fi gure below may be used to select the appropriate waypoint circle when creating the
route.
Boat speed in knots
30
25
20
15
10
5
Example: With the speed of 20 knots you should use a waypoint circle with radius 0.09 nm.
 Note:
The distance between any waypoints in a route must not be smaller than the radius of
the waypoint arrival circle when using automatic waypoint shift.
The operational modes | AP70/AP80 Operator Manual
A
C
E
G
WP1
Arrival circles
1 2 3 4 5 6 7
B
D
F
H
WP2
radius in 1/100 nm
8 9 10 11 12 13
arrival circle,