Worksheet 501 · Skill 5

Set and drift

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1. At 1030 your fix is 218°T, 2.6 nm from Gannet Rock daybeacon. You steer 058°T at 6.1 kn through the water. At 1110 a new fix puts you 071°T, 2.9 nm from Gannet Rock daybeacon.

   Plot the 1110 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 1440 your fix is 274°T, 2.1 nm from Tern Island tower. You steer 171°T at 6.9 kn through the water. At 1520 a new fix puts you 211°T, 3.3 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1400 your fix is 151°T, 0.8 nm from Gannet Rock daybeacon. You steer 263°T at 5.1 kn through the water. At 1430 a new fix puts you 235°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1430 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 1110 your fix is 354°T, 2.2 nm from Mill stack. You steer 323°T at 7.5 kn through the water. At 1145 a new fix puts you 102°T, 2.1 nm from Westfield church spire.

   Plot the 1145 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  

5. At 1345 your fix is 332°T, 1.1 nm from Kittle water tank. You steer 359°T at 5.4 kn through the water. At 1455 a new fix puts you 029°T, 2.5 nm from Gannet Rock daybeacon.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1315 your fix is 356°T, 2.1 nm from Heron Point Light. You steer 357°T at 7.4 kn through the water. At 1345 a new fix puts you 058°T, 2.2 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1050 your fix is 086°T, 1.6 nm from Westfield church spire. You steer 113°T at 5.8 kn through the water. At 1140 a new fix puts you 232°T, 2.3 nm from Tern Island tower.

   Plot the 1140 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 1240 your fix is 334°T, 1.2 nm from Kittle water tank. You steer 303°T at 6.8 kn through the water. At 1320 a new fix puts you 210°T, 2.6 nm from Tern Island tower.

   Plot the 1320 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