Worksheet 417 · Skill 5

Set and drift

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1. At 1200 your fix is 020°T, 2.3 nm from Tern Island tower. You steer 229°T at 6.7 kn through the water. At 1230 a new fix puts you 281°T, 1.8 nm from Tern Island tower.

   Plot the 1230 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0825 your fix is 058°T, 4.0 nm from Tern Island tower. You steer 163°T at 4.0 kn through the water. At 0930 a new fix puts you 046°T, 4.1 nm from Gannet Rock daybeacon.

   Plot the 0930 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1440 your fix is 025°T, 1.3 nm from Heron Point Light. You steer 034°T at 6.4 kn through the water. At 1540 a new fix puts you 340°T, 1.7 nm from Tern Island tower.

   Plot the 1540 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1550 your fix is 094°T, 1.8 nm from Gannet Rock daybeacon. You steer 006°T at 4.6 kn through the water. At 1635 a new fix puts you 076°T, 2.5 nm from Tern Island tower.

   Plot the 1635 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1115 your fix is 262°T, 2.8 nm from Gannet Rock daybeacon. You steer 109°T at 8.7 kn through the water. At 1155 a new fix puts you 056°T, 1.9 nm from Kittle water tank.

   Plot the 1155 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1325 your fix is 065°T, 2.3 nm from Heron Point Light. You steer 023°T at 9.0 kn through the water. At 1400 a new fix puts you 331°T, 2.8 nm from Tern Island tower.

   Plot the 1400 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0810 your fix is 284°T, 2.0 nm from Tern Island tower. You steer 284°T at 4.3 kn through the water. At 0850 a new fix puts you 303°T, 4.7 nm from Tern Island tower.

   Plot the 0850 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0950 your fix is 333°T, 2.8 nm from Tern Island tower. You steer 203°T at 4.6 kn through the water. At 1020 a new fix puts you 274°T, 2.4 nm from Tern Island tower.

   Plot the 1020 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn