Worksheet 605 · Skill 5

Set and drift

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1. At 0735 your fix is 243°T, 3.5 nm from Tern Island tower. You steer 003°T at 4.3 kn through the water. At 0830 a new fix puts you 314°T, 3.3 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1010 your fix is 223°T, 2.5 nm from Tern Island tower. You steer 111°T at 6.4 kn through the water. At 1110 a new fix puts you 159°T, 1.0 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1135 your fix is 355°T, 1.1 nm from Kittle water tank. You steer 304°T at 6.0 kn through the water. At 1305 a new fix puts you 281°T, 2.8 nm from Tern Island tower.

   Plot the 1305 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1240 your fix is 019°T, 2.1 nm from Mill stack. You steer 310°T at 6.5 kn through the water. At 1335 a new fix puts you 070°T, 3.6 nm from Westfield church spire.

   Plot the 1335 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1020 your fix is 236°T, 1.3 nm from Tern Island tower. You steer 165°T at 4.7 kn through the water. At 1055 a new fix puts you 263°T, 3.0 nm from Gannet Rock daybeacon.

   Plot the 1055 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 1110 your fix is 017°T, 2.7 nm from Westfield church spire. You steer 171°T at 6.0 kn through the water. At 1155 a new fix puts you 019°T, 1.2 nm from Heron Point Light.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1420 your fix is 260°T, 1.9 nm from Gannet Rock daybeacon. You steer 310°T at 8.9 kn through the water. At 1455 a new fix puts you 076°T, 2.7 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1240 your fix is 240°T, 2.1 nm from Gannet Rock daybeacon. You steer 030°T at 5.1 kn through the water. At 1340 a new fix puts you 039°T, 4.3 nm from Gannet Rock daybeacon.

   Plot the 1340 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