Worksheet 369 · Skill 5

Set and drift

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1. At 1415 your fix is 228°T, 1.5 nm from Gannet Rock daybeacon. You steer 271°T at 7.8 kn through the water. At 1455 a new fix puts you 047°T, 3.0 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1430 your fix is 233°T, 2.0 nm from Gannet Rock daybeacon. You steer 324°T at 8.9 kn through the water. At 1500 a new fix puts you 245°T, 1.9 nm from Tern Island tower.

   Plot the 1500 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  

3. At 1410 your fix is 017°T, 1.3 nm from Heron Point Light. You steer 073°T at 7.4 kn through the water. At 1440 a new fix puts you 193°T, 1.8 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1515 your fix is 285°T, 1.9 nm from Tern Island tower. You steer 294°T at 7.4 kn through the water. At 1555 a new fix puts you 029°T, 3.9 nm from Westfield church spire.

   Plot the 1555 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 1410 your fix is 343°T, 2.5 nm from Tern Island tower. You steer 114°T at 7.2 kn through the water. At 1445 a new fix puts you 069°T, 3.1 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0750 your fix is 075°T, 0.9 nm from Heron Point Light. You steer 062°T at 6.2 kn through the water. At 0830 a new fix puts you 016°T, 2.7 nm from Mill stack.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1245 your fix is 024°T, 1.8 nm from Gannet Rock daybeacon. You steer 253°T at 8.3 kn through the water. At 1315 a new fix puts you 273°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 1315 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  

8. At 0910 your fix is 100°T, 1.6 nm from Tern Island tower. You steer 110°T at 5.0 kn through the water. At 0950 a new fix puts you 050°T, 2.6 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn