Worksheet 467 · Skill 5

Set and drift

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1. At 1010 your fix is 060°T, 1.5 nm from Westfield church spire. You steer 059°T at 5.7 kn through the water. At 1045 a new fix puts you 274°T, 3.1 nm from Tern Island tower.

   Plot the 1045 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  

2. At 1500 your fix is 068°T, 3.6 nm from Westfield church spire. You steer 073°T at 8.1 kn through the water. At 1535 a new fix puts you 357°T, 1.5 nm from Tern Island tower.

   Plot the 1535 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 1215 your fix is 063°T, 2.7 nm from Westfield church spire. You steer 204°T at 6.2 kn through the water. At 1250 a new fix puts you 010°T, 1.5 nm from Heron Point Light.

   Plot the 1250 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  

4. At 0840 your fix is 250°T, 2.0 nm from Tern Island tower. You steer 325°T at 4.9 kn through the water. At 0925 a new fix puts you 041°T, 4.3 nm from Westfield church spire.

   Plot the 0925 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 1340 your fix is 076°T, 2.0 nm from Tern Island tower. You steer 173°T at 4.2 kn through the water. At 1440 a new fix puts you 036°T, 1.9 nm from Kittle water tank.

   Plot the 1440 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  

6. At 1145 your fix is 288°T, 1.9 nm from Tern Island tower. You steer 197°T at 5.3 kn through the water. At 1225 a new fix puts you 229°T, 3.4 nm from Tern Island tower.

   Plot the 1225 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  

7. At 1040 your fix is 082°T, 1.0 nm from Westfield church spire. You steer 118°T at 7.2 kn through the water. At 1125 a new fix puts you 060°T, 2.8 nm from Heron Point Light.

   Plot the 1125 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 0715 your fix is 342°T, 1.1 nm from Heron Point Light. You steer 049°T at 4.8 kn through the water. At 0815 a new fix puts you 243°T, 1.9 nm from Tern Island tower.

   Plot the 0815 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