Simrad AP28 Operator's Manual page 27

Negative values indicate decreasing radius while positive
values indicate increasing radius.
Increasing radius
Turn parameter
Initial radius
Change of radius
per turn
The unit for radius is the same as the unit set for depth
(feet or meter).
MENU
Decreasing radius
Range
33 ft - 3281 ft
10 m - 1000 m
-164 ft - +164 ft
-50 m - +50 m
Change
Default
per step
10 164 ft
10 50 m
5 66 ft
2 20 m
Operation | 27