Worksheet 522 · Skill 5

Set and drift

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1. At 1400 your fix is 340°T, 0.9 nm from Heron Point Light. You steer 044°T at 4.4 kn through the water. At 1455 a new fix puts you 274°T, 3.2 nm from Tern Island tower.

   Plot the 1455 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1200 your fix is 064°T, 3.0 nm from Gannet Rock daybeacon. You steer 254°T at 7.1 kn through the water. At 1240 a new fix puts you 206°T, 2.7 nm from Tern Island tower.

   Plot the 1240 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  

3. At 1335 your fix is 058°T, 3.3 nm from Tern Island tower. You steer 160°T at 5.8 kn through the water. At 1430 a new fix puts you 036°T, 2.1 nm from Kittle water tank.

   Plot the 1430 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0815 your fix is 058°T, 1.8 nm from Heron Point Light. You steer 063°T at 4.0 kn through the water. At 0910 a new fix puts you 232°T, 1.7 nm from Tern Island tower.

   Plot the 0910 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1100 your fix is 309°T, 2.1 nm from Tern Island tower. You steer 243°T at 7.7 kn through the water. At 1130 a new fix puts you 064°T, 2.2 nm from Westfield church spire.

   Plot the 1130 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  

6. At 1150 your fix is 253°T, 3.5 nm from Tern Island tower. You steer 166°T at 5.2 kn through the water. At 1220 a new fix puts you 057°T, 2.8 nm from Heron Point Light.

   Plot the 1220 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  

7. At 1315 your fix is 279°T, 1.7 nm from Gannet Rock daybeacon. You steer 065°T at 4.5 kn through the water. At 1415 a new fix puts you 067°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1415 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  

8. At 1545 your fix is 050°T, 1.2 nm from Gannet Rock daybeacon. You steer 353°T at 4.4 kn through the water. At 1635 a new fix puts you 084°T, 2.4 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn