Worksheet 53 · Skill 5

Set and drift

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1. At 0805 your fix is 310°T, 3.4 nm from Tern Island tower. You steer 196°T at 4.0 kn through the water. At 0920 a new fix puts you 076°T, 2.5 nm from Heron Point Light.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1055 your fix is 039°T, 1.7 nm from Westfield church spire. You steer 153°T at 5.1 kn through the water. At 1125 a new fix puts you 090°T, 2.6 nm from Westfield church spire.

   Plot the 1125 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 0720 your fix is 027°T, 2.7 nm from Gannet Rock daybeacon. You steer 180°T at 4.2 kn through the water. At 0805 a new fix puts you 336°T, 1.7 nm from Kittle water tank.

   Plot the 0805 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 0745 your fix is 002°T, 3.1 nm from Mill stack. You steer 297°T at 4.7 kn through the water. At 0815 a new fix puts you 043°T, 2.9 nm from Heron Point Light.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1520 your fix is 104°T, 2.1 nm from Westfield church spire. You steer 029°T at 5.8 kn through the water. At 1555 a new fix puts you 288°T, 3.0 nm from Tern Island tower.

   Plot the 1555 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 1555 your fix is 048°T, 1.6 nm from Tern Island tower. You steer 146°T at 5.3 kn through the water. At 1640 a new fix puts you 094°T, 1.6 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1110 your fix is 330°T, 2.0 nm from Mill stack. You steer 009°T at 5.7 kn through the water. At 1215 a new fix puts you 309°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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1240 your fix is 080°T, 2.2 nm from Tern Island tower. You steer 213°T at 5.0 kn through the water. At 1325 a new fix puts you 249°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 1325 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