Worksheet 750 · Skill 5

Set and drift

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1. At 1325 your fix is 351°T, 1.6 nm from Gannet Rock daybeacon. You steer 129°T at 5.6 kn through the water. At 1355 a new fix puts you 090°T, 2.9 nm from Gannet Rock daybeacon.

   Plot the 1355 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 1400 your fix is 196°T, 2.0 nm from Gannet Rock daybeacon. You steer 250°T at 5.0 kn through the water. At 1430 a new fix puts you 048°T, 1.9 nm from Mill stack.

   Plot the 1430 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 1320 your fix is 004°T, 1.0 nm from Westfield church spire. You steer 089°T at 5.9 kn through the water. At 1410 a new fix puts you 242°T, 3.3 nm from Tern Island tower.

   Plot the 1410 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  

4. At 1405 your fix is 017°T, 3.3 nm from Westfield church spire. You steer 127°T at 7.9 kn through the water. At 1510 a new fix puts you 268°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1510 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 1525 your fix is 224°T, 1.3 nm from Gannet Rock daybeacon. You steer 017°T at 7.3 kn through the water. At 1600 a new fix puts you 061°T, 3.4 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  

6. At 0905 your fix is 220°T, 3.2 nm from Tern Island tower. You steer 297°T at 4.6 kn through the water. At 0955 a new fix puts you 075°T, 3.4 nm from Westfield church spire.

   Plot the 0955 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  

7. At 0815 your fix is 288°T, 3.2 nm from Tern Island tower. You steer 149°T at 4.6 kn through the water. At 0930 a new fix puts you 027°T, 2.4 nm from Mill stack.

   Plot the 0930 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  

8. At 1235 your fix is 204°T, 3.1 nm from Tern Island tower. You steer 310°T at 8.2 kn through the water. At 1315 a new fix puts you 042°T, 3.3 nm from Westfield church spire.

   Plot the 1315 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