Worksheet 837 · Skill 5

Set and drift

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1. At 1120 your fix is 264°T, 3.4 nm from Tern Island tower. You steer 166°T at 5.6 kn through the water. At 1150 a new fix puts you 212°T, 3.2 nm from Tern Island tower.

   Plot the 1150 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  

2. At 1305 your fix is 274°T, 2.0 nm from Tern Island tower. You steer 190°T at 7.3 kn through the water. At 1340 a new fix puts you 067°T, 2.8 nm from Heron Point Light.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1425 your fix is 356°T, 1.9 nm from Mill stack. You steer 291°T at 4.2 kn through the water. At 1520 a new fix puts you 055°T, 1.0 nm from Heron Point Light.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0700 your fix is 269°T, 1.9 nm from Tern Island tower. You steer 308°T at 4.4 kn through the water. At 0740 a new fix puts you 027°T, 3.8 nm from Westfield church spire.

   Plot the 0740 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  

5. At 0805 your fix is 329°T, 1.3 nm from Tern Island tower. You steer 248°T at 8.2 kn through the water. At 0835 a new fix puts you 073°T, 3.6 nm from Westfield church spire.

   Plot the 0835 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 1305 your fix is 027°T, 2.5 nm from Mill stack. You steer 287°T at 4.1 kn through the water. At 1340 a new fix puts you 228°T, 3.1 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1300 your fix is 261°T, 3.1 nm from Gannet Rock daybeacon. You steer 311°T at 7.1 kn through the water. At 1345 a new fix puts you 072°T, 2.3 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1545 your fix is 313°T, 3.0 nm from Tern Island tower. You steer 209°T at 6.4 kn through the water. At 1645 a new fix puts you 335°T, 1.3 nm from Heron Point Light.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn