Worksheet 351 · Skill 5

Set and drift

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1. At 1430 your fix is 053°T, 1.5 nm from Gannet Rock daybeacon. You steer 000°T at 6.7 kn through the water. At 1505 a new fix puts you 071°T, 3.8 nm from Tern Island tower.

   Plot the 1505 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  

2. At 1410 your fix is 035°T, 1.9 nm from Heron Point Light. You steer 123°T at 4.0 kn through the water. At 1440 a new fix puts you 075°T, 2.4 nm from Heron Point Light.

   Plot the 1440 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 1415 your fix is 203°T, 1.9 nm from Gannet Rock daybeacon. You steer 300°T at 5.3 kn through the water. At 1500 a new fix puts you 213°T, 2.7 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0825 your fix is 295°T, 3.8 nm from Tern Island tower. You steer 188°T at 6.5 kn through the water. At 0910 a new fix puts you 048°T, 1.1 nm from Heron Point Light.

   Plot the 0910 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  

5. At 0700 your fix is 169°T, 1.0 nm from Gannet Rock daybeacon. You steer 309°T at 7.4 kn through the water. At 0730 a new fix puts you 197°T, 2.0 nm from Tern Island tower.

   Plot the 0730 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 1545 your fix is 026°T, 2.7 nm from Westfield church spire. You steer 089°T at 7.0 kn through the water. At 1630 a new fix puts you 349°T, 2.0 nm from Tern Island tower.

   Plot the 1630 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 1055 your fix is 215°T, 1.9 nm from Gannet Rock daybeacon. You steer 019°T at 4.8 kn through the water. At 1215 a new fix puts you 045°T, 3.0 nm from Tern Island tower.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0950 your fix is 270°T, 3.4 nm from Tern Island tower. You steer 235°T at 4.1 kn through the water. At 1025 a new fix puts you 085°T, 2.2 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn