Worksheet 507 · Skill 5

Set and drift

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1. At 1225 your fix is 248°T, 2.2 nm from Gannet Rock daybeacon. You steer 306°T at 4.1 kn through the water. At 1305 a new fix puts you 250°T, 2.0 nm from Tern Island tower.

   Plot the 1305 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 1545 your fix is 059°T, 3.1 nm from Westfield church spire. You steer 154°T at 5.7 kn through the water. At 1640 a new fix puts you 069°T, 1.7 nm from Heron Point Light.

   Plot the 1640 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  

3. At 1140 your fix is 261°T, 2.0 nm from Gannet Rock daybeacon. You steer 300°T at 7.3 kn through the water. At 1245 a new fix puts you 045°T, 2.4 nm from Westfield church spire.

   Plot the 1245 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  

4. At 0815 your fix is 202°T, 2.3 nm from Gannet Rock daybeacon. You steer 285°T at 5.4 kn through the water. At 0945 a new fix puts you 013°T, 2.1 nm from Westfield church spire.

   Plot the 0945 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  

5. At 1205 your fix is 125°T, 1.8 nm from Gannet Rock daybeacon. You steer 026°T at 5.1 kn through the water. At 1235 a new fix puts you 052°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 1235 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 0850 your fix is 089°T, 2.3 nm from Westfield church spire. You steer 086°T at 5.4 kn through the water. At 0935 a new fix puts you 287°T, 1.3 nm from Tern Island tower.

   Plot the 0935 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 327°T, 1.5 nm from Heron Point Light. You steer 038°T at 8.4 kn through the water. At 1450 a new fix puts you 345°T, 2.0 nm from Tern Island tower.

   Plot the 1450 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 1350 your fix is 329°T, 2.3 nm from Tern Island tower. You steer 105°T at 4.8 kn through the water. At 1430 a new fix puts you 043°T, 2.9 nm from Tern Island tower.

   Plot the 1430 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