Worksheet 644 · Skill 5

Set and drift

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1. At 1225 your fix is 010°T, 2.3 nm from Westfield church spire. You steer 082°T at 8.6 kn through the water. At 1300 a new fix puts you 315°T, 1.2 nm from Tern Island tower.

   Plot the 1300 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 1025 your fix is 052°T, 2.7 nm from Tern Island tower. You steer 140°T at 5.5 kn through the water. At 1100 a new fix puts you 066°T, 2.9 nm from Gannet Rock daybeacon.

   Plot the 1100 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 0745 your fix is 079°T, 3.5 nm from Westfield church spire. You steer 060°T at 8.3 kn through the water. At 0820 a new fix puts you 357°T, 1.8 nm from Tern Island tower.

   Plot the 0820 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 1335 your fix is 076°T, 2.8 nm from Westfield church spire. You steer 120°T at 4.9 kn through the water. At 1415 a new fix puts you 355°T, 2.9 nm from Mill stack.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1450 your fix is 257°T, 2.8 nm from Gannet Rock daybeacon. You steer 054°T at 4.9 kn through the water. At 1530 a new fix puts you 087°T, 2.5 nm from Tern Island tower.

   Plot the 1530 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 1225 your fix is 024°T, 3.6 nm from Westfield church spire. You steer 132°T at 5.6 kn through the water. At 1310 a new fix puts you 090°T, 2.8 nm from Westfield church spire.

   Plot the 1310 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  

7. At 0820 your fix is 301°T, 2.1 nm from Tern Island tower. You steer 191°T at 7.8 kn through the water. At 0855 a new fix puts you 217°T, 2.9 nm from Tern Island tower.

   Plot the 0855 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  

8. At 1105 your fix is 140°T, 1.7 nm from Gannet Rock daybeacon. You steer 286°T at 7.5 kn through the water. At 1215 a new fix puts you 085°T, 2.3 nm from Westfield church spire.

   Plot the 1215 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn