Worksheet 928 · Skill 5

Set and drift

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1. At 0925 your fix is 066°T, 1.5 nm from Heron Point Light. You steer 349°T at 5.6 kn through the water. At 1005 a new fix puts you 064°T, 1.7 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0945 your fix is 279°T, 3.3 nm from Tern Island tower. You steer 139°T at 8.1 kn through the water. At 1025 a new fix puts you 226°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1025 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  

3. At 1125 your fix is 029°T, 3.7 nm from Westfield church spire. You steer 124°T at 8.7 kn through the water. At 1200 a new fix puts you 275°T, 1.7 nm from Tern Island tower.

   Plot the 1200 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 1510 your fix is 089°T, 3.7 nm from Westfield church spire. You steer 110°T at 8.7 kn through the water. At 1545 a new fix puts you 245°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 1545 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 1340 your fix is 014°T, 1.8 nm from Gannet Rock daybeacon. You steer 225°T at 4.3 kn through the water. At 1445 a new fix puts you 242°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 1445 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  

6. At 0700 your fix is 037°T, 3.7 nm from Westfield church spire. You steer 133°T at 8.7 kn through the water. At 0755 a new fix puts you 205°T, 2.7 nm from Tern Island tower.

   Plot the 0755 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  

7. At 1025 your fix is 041°T, 3.0 nm from Tern Island tower. You steer 255°T at 8.6 kn through the water. At 1120 a new fix puts you 067°T, 2.3 nm from Westfield church spire.

   Plot the 1120 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 1240 your fix is 356°T, 3.1 nm from Mill stack. You steer 337°T at 4.7 kn through the water. At 1325 a new fix puts you 261°T, 2.3 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn