Worksheet 231 · Skill 5

Set and drift

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1. At 0950 your fix is 257°T, 2.8 nm from Gannet Rock daybeacon. You steer 293°T at 4.9 kn through the water. At 1025 a new fix puts you 260°T, 3.6 nm from Tern Island tower.

   Plot the 1025 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 0830 your fix is 286°T, 1.4 nm from Gannet Rock daybeacon. You steer 273°T at 7.9 kn through the water. At 0905 a new fix puts you 091°T, 3.4 nm from Westfield church spire.

   Plot the 0905 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 1335 your fix is 072°T, 2.4 nm from Heron Point Light. You steer 341°T at 5.4 kn through the water. At 1410 a new fix puts you 258°T, 3.3 nm from Tern Island tower.

   Plot the 1410 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 1405 your fix is 053°T, 2.8 nm from Tern Island tower. You steer 172°T at 5.9 kn through the water. At 1455 a new fix puts you 149°T, 2.7 nm from Tern Island tower.

   Plot the 1455 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  

5. At 1300 your fix is 029°T, 2.5 nm from Heron Point Light. You steer 124°T at 6.0 kn through the water. At 1345 a new fix puts you 054°T, 2.1 nm from Mill stack.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1340 your fix is 274°T, 1.8 nm from Tern Island tower. You steer 246°T at 7.1 kn through the water. At 1420 a new fix puts you 017°T, 2.4 nm from Heron Point Light.

   Plot the 1420 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 1545 your fix is 235°T, 3.5 nm from Tern Island tower. You steer 088°T at 7.5 kn through the water. At 1645 a new fix puts you 054°T, 0.9 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0940 your fix is 233°T, 2.4 nm from Gannet Rock daybeacon. You steer 328°T at 4.3 kn through the water. At 1105 a new fix puts you 042°T, 4.1 nm from Westfield church spire.

   Plot the 1105 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