Worksheet 353 · Skill 5

Set and drift

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1. At 0725 your fix is 345°T, 2.6 nm from Tern Island tower. You steer 231°T at 6.2 kn through the water. At 0830 a new fix puts you 064°T, 2.3 nm from Westfield church spire.

   Plot the 0830 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  

2. At 0710 your fix is 236°T, 3.1 nm from Tern Island tower. You steer 358°T at 5.6 kn through the water. At 0745 a new fix puts you 304°T, 2.7 nm from Tern Island tower.

   Plot the 0745 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  

3. At 1030 your fix is 343°T, 2.2 nm from Mill stack. You steer 339°T at 6.0 kn through the water. At 1130 a new fix puts you 029°T, 1.8 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0935 your fix is 230°T, 3.3 nm from Tern Island tower. You steer 089°T at 4.6 kn through the water. At 1040 a new fix puts you 134°T, 2.7 nm from Tern Island tower.

   Plot the 1040 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  

5. At 0940 your fix is 189°T, 1.2 nm from Tern Island tower. You steer 172°T at 4.1 kn through the water. At 1030 a new fix puts you 293°T, 2.1 nm from Kittle water tank.

   Plot the 1030 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  

6. At 1030 your fix is 047°T, 3.2 nm from Heron Point Light. You steer 107°T at 4.2 kn through the water. At 1120 a new fix puts you 186°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 1120 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  

7. At 1030 your fix is 226°T, 2.2 nm from Gannet Rock daybeacon. You steer 080°T at 6.4 kn through the water. At 1115 a new fix puts you 081°T, 2.8 nm from Gannet Rock daybeacon.

   Plot the 1115 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  

8. At 1455 your fix is 266°T, 1.9 nm from Tern Island tower. You steer 300°T at 8.0 kn through the water. At 1525 a new fix puts you 034°T, 4.1 nm from Westfield church spire.

   Plot the 1525 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