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Copyright
W
ORKSHEET
9: S
ET
AND
DRIFT
Q1.Calculate the set and drift to determine a ships heading to a research site using the information below
At 0615 you depart the anchorage west of Carlisle Island, steering a compass course of 261
0
(C) at 5 knots. At 0703, Allonby
Island bears 334.5
0
(C) and Skiddaw Peak (129) bears 069.5
0
(C).
a. What is your fixed position at 0703?
CC = TC =
Allonby bears C = T
Skiddaw bears C = T
Position at 0703 is approx
b. What set and drift have you experienced since departing the anchorage?
Q2.From a position 1.5 nautical miles north of the centre of Cockermouth Island, you steer a compass course of 315
0
(C) at 6 knots
for 1 hour.
At this time you fix your position as follows:
Carlisle Is (E)
184
0
Tinsmith Is (N)
260
0
Cockermouth Is (E)
134
0
a. What is your fixed position at this time?
b. What set and drift have you experienced?
Q3.You wish to sail from one nautical mile South of Allonby Island to Anchorage at Maryport B near Carlisle Island.
You will experience a set and drift of 1.25 Nautical miles at 20
0
T. Your speed is 4 knots.
What is the compass course you will need to steer and how long will it take you to reach your destination?
