Worksheet 731 · Skill 5

Set and drift

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1. At 1115 your fix is 246°T, 2.7 nm from Gannet Rock daybeacon. You steer 317°T at 8.0 kn through the water. At 1215 a new fix puts you 061°T, 3.2 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1105 your fix is 226°T, 2.6 nm from Tern Island tower. You steer 085°T at 7.7 kn through the water. At 1135 a new fix puts you 034°T, 0.9 nm from Gannet Rock daybeacon.

   Plot the 1135 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 1200 your fix is 005°T, 1.8 nm from Westfield church spire. You steer 123°T at 5.6 kn through the water. At 1330 a new fix puts you 261°T, 2.9 nm from Gannet Rock daybeacon.

   Plot the 1330 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 1330 your fix is 012°T, 1.7 nm from Westfield church spire. You steer 082°T at 5.7 kn through the water. At 1405 a new fix puts you 295°T, 4.1 nm from Tern Island tower.

   Plot the 1405 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 0810 your fix is 028°T, 1.8 nm from Heron Point Light. You steer 096°T at 7.3 kn through the water. At 0840 a new fix puts you 267°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 0840 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 1325 your fix is 028°T, 2.5 nm from Mill stack. You steer 284°T at 5.3 kn through the water. At 1410 a new fix puts you 056°T, 1.3 nm from Heron Point Light.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1400 your fix is 357°T, 2.8 nm from Mill stack. You steer 313°T at 6.6 kn through the water. At 1455 a new fix puts you 036°T, 1.5 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0915 your fix is 355°T, 3.0 nm from Mill stack. You steer 310°T at 4.5 kn through the water. At 1005 a new fix puts you 056°T, 2.6 nm from Westfield church spire.

   Plot the 1005 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