Worksheet 287 · Skill 5

Set and drift

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1. At 0935 your fix is 041°T, 2.2 nm from Heron Point Light. You steer 061°T at 5.1 kn through the water. At 1015 a new fix puts you 222°T, 2.3 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1325 your fix is 306°T, 1.7 nm from Kittle water tank. You steer 020°T at 7.7 kn through the water. At 1405 a new fix puts you 059°T, 3.6 nm from Gannet Rock daybeacon.

   Plot the 1405 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 1335 your fix is 060°T, 3.7 nm from Westfield church spire. You steer 133°T at 4.5 kn through the water. At 1420 a new fix puts you 203°T, 1.9 nm from Tern Island tower.

   Plot the 1420 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 1545 your fix is 130°T, 3.0 nm from Tern Island tower. You steer 284°T at 7.4 kn through the water. At 1625 a new fix puts you 047°T, 3.3 nm from Heron Point Light.

   Plot the 1625 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  

5. At 1300 your fix is 126°T, 1.8 nm from Westfield church spire. You steer 352°T at 4.2 kn through the water. At 1335 a new fix puts you 044°T, 3.0 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0730 your fix is 225°T, 3.1 nm from Tern Island tower. You steer 127°T at 4.5 kn through the water. At 0815 a new fix puts you 213°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 0815 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 0950 your fix is 019°T, 1.3 nm from Gannet Rock daybeacon. You steer 330°T at 4.1 kn through the water. At 1025 a new fix puts you 043°T, 2.4 nm from Tern Island tower.

   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  

8. At 1530 your fix is 047°T, 3.3 nm from Gannet Rock daybeacon. You steer 236°T at 5.5 kn through the water. At 1610 a new fix puts you 189°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 1610 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