Worksheet 142 · Skill 5

Set and drift

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1. At 1020 your fix is 275°T, 1.9 nm from Gannet Rock daybeacon. You steer 306°T at 6.1 kn through the water. At 1130 a new fix puts you 056°T, 2.7 nm from Westfield church spire.

   Plot the 1130 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0700 your fix is 180°T, 1.2 nm from Gannet Rock daybeacon. You steer 247°T at 6.3 kn through the water. At 0730 a new fix puts you 001°T, 1.7 nm from Mill stack.

   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  

3. At 0805 your fix is 073°T, 3.4 nm from Westfield church spire. You steer 175°T at 4.4 kn through the water. At 0850 a new fix puts you 043°T, 2.2 nm from Heron Point Light.

   Plot the 0850 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 1320 your fix is 198°T, 2.3 nm from Gannet Rock daybeacon. You steer 300°T at 6.5 kn through the water. At 1425 a new fix puts you 040°T, 2.4 nm from Westfield church spire.

   Plot the 1425 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  

5. At 1550 your fix is 013°T, 2.4 nm from Westfield church spire. You steer 109°T at 5.9 kn through the water. At 1640 a new fix puts you 273°T, 3.1 nm from Tern Island tower.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0730 your fix is 353°T, 0.9 nm from Gannet Rock daybeacon. You steer 123°T at 5.4 kn through the water. At 0810 a new fix puts you 019°T, 1.8 nm from Kittle water tank.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0950 your fix is 048°T, 1.2 nm from Gannet Rock daybeacon. You steer 290°T at 4.3 kn through the water. At 1020 a new fix puts you 185°T, 1.9 nm from Tern Island tower.

   Plot the 1020 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  

8. At 0825 your fix is 104°T, 2.6 nm from Gannet Rock daybeacon. You steer 347°T at 4.6 kn through the water. At 0940 a new fix puts you 033°T, 1.4 nm from Tern Island tower.

   Plot the 0940 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn