Worksheet 857 · Skill 5

Set and drift

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1. At 1235 your fix is 247°T, 1.0 nm from Gannet Rock daybeacon. You steer 294°T at 4.0 kn through the water. At 1325 a new fix puts you 232°T, 3.0 nm from Tern Island tower.

   Plot the 1325 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 1425 your fix is 043°T, 2.1 nm from Heron Point Light. You steer 351°T at 4.7 kn through the water. At 1530 a new fix puts you 073°T, 2.4 nm from Westfield church spire.

   Plot the 1530 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  

3. At 0755 your fix is 337°T, 1.5 nm from Gannet Rock daybeacon. You steer 075°T at 6.5 kn through the water. At 0830 a new fix puts you 056°T, 3.5 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1250 your fix is 005°T, 2.2 nm from Mill stack. You steer 316°T at 8.1 kn through the water. At 1340 a new fix puts you 027°T, 3.1 nm from Westfield church spire.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1325 your fix is 241°T, 2.5 nm from Gannet Rock daybeacon. You steer 300°T at 4.2 kn through the water. At 1415 a new fix puts you 234°T, 2.1 nm from Tern Island tower.

   Plot the 1415 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  

6. At 1425 your fix is 270°T, 2.6 nm from Tern Island tower. You steer 241°T at 5.9 kn through the water. At 1500 a new fix puts you 092°T, 2.6 nm from Westfield church spire.

   Plot the 1500 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 0825 your fix is 003°T, 2.7 nm from Mill stack. You steer 056°T at 6.8 kn through the water. At 0915 a new fix puts you 100°T, 2.1 nm from Tern Island tower.

   Plot the 0915 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 1525 your fix is 000°T, 2.8 nm from Mill stack. You steer 092°T at 7.2 kn through the water. At 1600 a new fix puts you 348°T, 1.3 nm from Kittle water tank.

   Plot the 1600 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