Worksheet 419 · Skill 5

Set and drift

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1. At 1120 your fix is 041°T, 1.6 nm from Westfield church spire. You steer 118°T at 8.4 kn through the water. At 1155 a new fix puts you 227°T, 3.3 nm from Tern Island tower.

   Plot the 1155 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 1545 your fix is 280°T, 2.2 nm from Tern Island tower. You steer 167°T at 4.5 kn through the water. At 1645 a new fix puts you 356°T, 1.7 nm from Mill stack.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1400 your fix is 257°T, 3.0 nm from Tern Island tower. You steer 051°T at 4.5 kn through the water. At 1445 a new fix puts you 328°T, 1.3 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1435 your fix is 258°T, 3.6 nm from Tern Island tower. You steer 099°T at 4.3 kn through the water. At 1520 a new fix puts you 226°T, 2.8 nm from Tern Island tower.

   Plot the 1520 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 0705 your fix is 078°T, 2.4 nm from Heron Point Light. You steer 331°T at 7.2 kn through the water. At 0740 a new fix puts you 044°T, 2.7 nm from Westfield church spire.

   Plot the 0740 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  

6. At 0920 your fix is 339°T, 2.6 nm from Mill stack. You steer 293°T at 4.7 kn through the water. At 0950 a new fix puts you 331°T, 1.3 nm from Heron Point Light.

   Plot the 0950 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 0810 your fix is 135°T, 0.9 nm from Westfield church spire. You steer 045°T at 7.2 kn through the water. At 0900 a new fix puts you 312°T, 2.5 nm from Tern Island tower.

   Plot the 0900 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  

8. At 0755 your fix is 023°T, 2.5 nm from Tern Island tower. You steer 230°T at 4.5 kn through the water. At 0830 a new fix puts you 344°T, 1.4 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn