Worksheet 23 · Skill 5

Set and drift

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1. At 1525 your fix is 102°T, 2.1 nm from Westfield church spire. You steer 106°T at 5.5 kn through the water. At 1600 a new fix puts you 040°T, 3.1 nm from Heron Point Light.

   Plot the 1600 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 1215 your fix is 308°T, 1.6 nm from Kittle water tank. You steer 310°T at 5.1 kn through the water. At 1345 a new fix puts you 295°T, 3.3 nm from Tern Island tower.

   Plot the 1345 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1240 your fix is 117°T, 2.0 nm from Westfield church spire. You steer 127°T at 6.7 kn through the water. At 1310 a new fix puts you 064°T, 2.8 nm from Heron Point Light.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1335 your fix is 310°T, 2.0 nm from Tern Island tower. You steer 214°T at 4.3 kn through the water. At 1445 a new fix puts you 138°T, 1.2 nm from Westfield church spire.

   Plot the 1445 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  

5. At 1215 your fix is 102°T, 2.2 nm from Westfield church spire. You steer 015°T at 4.9 kn through the water. At 1245 a new fix puts you 065°T, 3.0 nm from Westfield church spire.

   Plot the 1245 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 0850 your fix is 076°T, 1.1 nm from Heron Point Light. You steer 020°T at 7.9 kn through the water. At 0930 a new fix puts you 282°T, 3.3 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1540 your fix is 067°T, 3.8 nm from Tern Island tower. You steer 197°T at 7.1 kn through the water. At 1625 a new fix puts you 332°T, 1.4 nm from Kittle water tank.

   Plot the 1625 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 1520 your fix is 057°T, 3.2 nm from Heron Point Light. You steer 102°T at 5.2 kn through the water. At 1645 a new fix puts you 202°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1645 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn