Worksheet 34 · Skill 5

Set and drift

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1. At 0905 your fix is 245°T, 2.4 nm from Tern Island tower. You steer 130°T at 7.5 kn through the water. At 0945 a new fix puts you 167°T, 1.7 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1500 your fix is 133°T, 3.3 nm from Tern Island tower. You steer 348°T at 5.9 kn through the water. At 1535 a new fix puts you 043°T, 2.0 nm from Tern Island tower.

   Plot the 1535 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 237°T, 3.5 nm from Tern Island tower. You steer 084°T at 4.4 kn through the water. At 1525 a new fix puts you 281°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 1525 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  

4. At 0745 your fix is 170°T, 1.5 nm from Westfield church spire. You steer 063°T at 8.0 kn through the water. At 0830 a new fix puts you 286°T, 2.7 nm from Tern Island tower.

   Plot the 0830 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 1015 your fix is 274°T, 3.0 nm from Tern Island tower. You steer 202°T at 7.8 kn through the water. At 1050 a new fix puts you 021°T, 1.2 nm from Heron Point Light.

   Plot the 1050 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  

6. At 1305 your fix is 013°T, 1.4 nm from Gannet Rock daybeacon. You steer 233°T at 4.8 kn through the water. At 1335 a new fix puts you 259°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 1335 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 0930 your fix is 340°T, 2.1 nm from Mill stack. You steer 052°T at 5.1 kn through the water. At 1015 a new fix puts you 188°T, 1.9 nm from Tern Island tower.

   Plot the 1015 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 1135 your fix is 014°T, 3.0 nm from Westfield church spire. You steer 109°T at 6.0 kn through the water. At 1220 a new fix puts you 315°T, 1.2 nm from Tern Island tower.

   Plot the 1220 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