Worksheet 803 · Skill 5

Set and drift

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1. At 0930 your fix is 342°T, 2.7 nm from Mill stack. You steer 085°T at 4.1 kn through the water. At 1020 a new fix puts you 285°T, 0.9 nm from Gannet Rock daybeacon.

   Plot the 1020 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  

2. At 1315 your fix is 061°T, 2.9 nm from Heron Point Light. You steer 296°T at 6.1 kn through the water. At 1350 a new fix puts you 104°T, 1.6 nm from Westfield church spire.

   Plot the 1350 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 1110 your fix is 054°T, 3.8 nm from Tern Island tower. You steer 266°T at 7.7 kn through the water. At 1215 a new fix puts you 039°T, 2.5 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1200 your fix is 168°T, 1.6 nm from Gannet Rock daybeacon. You steer 015°T at 4.2 kn through the water. At 1250 a new fix puts you 091°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 1250 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 1340 your fix is 077°T, 2.7 nm from Gannet Rock daybeacon. You steer 345°T at 8.7 kn through the water. At 1410 a new fix puts you 071°T, 4.5 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0720 your fix is 029°T, 0.8 nm from Heron Point Light. You steer 016°T at 4.4 kn through the water. At 0750 a new fix puts you 092°T, 2.0 nm from Westfield church spire.

   Plot the 0750 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 0835 your fix is 007°T, 1.7 nm from Kittle water tank. You steer 280°T at 6.2 kn through the water. At 0910 a new fix puts you 238°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 0910 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 1405 your fix is 076°T, 2.1 nm from Heron Point Light. You steer 334°T at 8.6 kn through the water. At 1445 a new fix puts you 043°T, 2.5 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn