Specifications

___________________________________________________H3000 Pilot Handbook
HB-3001-02
63
Step 4: Boat lag
Boat Lag is the time taken for the boat to respond to changes in helm.
Heavy displacement hulls require a larger value for boat lag.
Checking the boat lag:
At a speed not exceeding 15 knots, change course by 90
o
in either
direction.
Observe the Pilot steering performance. The boat should turn onto the new
heading with minimal overshoot (a slight overshoot is acceptable).
If the overshoot is consistently more than 5
o
for course changes in both
directions increase the Boat Lag value in steps of 0.1 until the overshoot is
corrected.
It is easier to spot overshoot than undershoot, hence if no overshoot is
observed decrease the boat lag in steps of 0.1 until a small overshoot is
seen. Use the smallest value of Boat Lag possible to minimise overshoot.
Boat Lag
Value Correct
Boat Lag
Value Incorrect (too small)
Boat Lag Response