Worksheet 267 · Skill 5

Set and drift

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1. At 0705 your fix is 040°T, 3.2 nm from Gannet Rock daybeacon. You steer 178°T at 6.2 kn through the water. At 0750 a new fix puts you 343°T, 1.3 nm from Kittle water tank.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1600 your fix is 298°T, 1.8 nm from Kittle water tank. You steer 319°T at 8.1 kn through the water. At 1645 a new fix puts you 256°T, 2.4 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0700 your fix is 055°T, 3.0 nm from Heron Point Light. You steer 330°T at 4.8 kn through the water. At 0800 a new fix puts you 032°T, 4.0 nm from Westfield church spire.

   Plot the 0800 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  

4. At 1345 your fix is 243°T, 2.9 nm from Tern Island tower. You steer 214°T at 4.2 kn through the water. At 1435 a new fix puts you 326°T, 2.1 nm from Mill stack.

   Plot the 1435 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 1415 your fix is 090°T, 2.5 nm from Tern Island tower. You steer 215°T at 7.2 kn through the water. At 1455 a new fix puts you 262°T, 1.9 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1320 your fix is 007°T, 2.8 nm from Mill stack. You steer 097°T at 5.8 kn through the water. At 1355 a new fix puts you 305°T, 1.9 nm from Kittle water tank.

   Plot the 1355 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  

7. At 1300 your fix is 073°T, 4.1 nm from Tern Island tower. You steer 182°T at 6.5 kn through the water. At 1335 a new fix puts you 065°T, 1.8 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0935 your fix is 221°T, 2.5 nm from Gannet Rock daybeacon. You steer 324°T at 7.7 kn through the water. At 1020 a new fix puts you 086°T, 3.7 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn