Worksheet 345 · Skill 5

Set and drift

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1. At 0740 your fix is 197°T, 1.3 nm from Tern Island tower. You steer 144°T at 4.9 kn through the water. At 0810 a new fix puts you 154°T, 2.5 nm from Tern Island tower.

   Plot the 0810 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 1525 your fix is 280°T, 3.2 nm from Tern Island tower. You steer 146°T at 5.8 kn through the water. At 1600 a new fix puts you 211°T, 2.1 nm from Tern Island tower.

   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  

3. At 0955 your fix is 024°T, 1.8 nm from Gannet Rock daybeacon. You steer 232°T at 4.8 kn through the water. At 1120 a new fix puts you 009°T, 0.9 nm from Heron Point Light.

   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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0855 your fix is 086°T, 2.7 nm from Westfield church spire. You steer 007°T at 4.6 kn through the water. At 0925 a new fix puts you 284°T, 3.5 nm from Tern Island tower.

   Plot the 0925 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  

5. At 0950 your fix is 069°T, 2.5 nm from Gannet Rock daybeacon. You steer 265°T at 6.3 kn through the water. At 1035 a new fix puts you 226°T, 2.5 nm from Tern Island tower.

   Plot the 1035 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  

6. At 1535 your fix is 247°T, 2.0 nm from Gannet Rock daybeacon. You steer 089°T at 4.9 kn through the water. At 1605 a new fix puts you 169°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1605 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  

7. At 0825 your fix is 196°T, 1.7 nm from Gannet Rock daybeacon. You steer 296°T at 5.8 kn through the water. At 0920 a new fix puts you 098°T, 2.6 nm from Westfield church spire.

   Plot the 0920 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 1330 your fix is 289°T, 1.8 nm from Tern Island tower. You steer 225°T at 5.2 kn through the water. At 1435 a new fix puts you 013°T, 1.6 nm from Heron Point Light.

   Plot the 1435 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