Worksheet 424 · Skill 5

Set and drift

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1. At 1420 your fix is 048°T, 3.5 nm from Westfield church spire. You steer 113°T at 5.9 kn through the water. At 1450 a new fix puts you 294°T, 2.2 nm from Tern Island tower.

   Plot the 1450 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 1550 your fix is 331°T, 2.4 nm from Mill stack. You steer 022°T at 4.1 kn through the water. At 1655 a new fix puts you 292°T, 3.3 nm from Tern Island tower.

   Plot the 1655 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  

3. At 1420 your fix is 095°T, 2.4 nm from Westfield church spire. You steer 108°T at 7.3 kn through the water. At 1500 a new fix puts you 006°T, 2.7 nm from Mill stack.

   Plot the 1500 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  

4. At 1425 your fix is 297°T, 1.7 nm from Gannet Rock daybeacon. You steer 278°T at 4.0 kn through the water. At 1455 a new fix puts you 219°T, 2.6 nm from Tern Island tower.

   Plot the 1455 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 1345 your fix is 279°T, 1.9 nm from Gannet Rock daybeacon. You steer 285°T at 6.1 kn through the water. At 1440 a new fix puts you 073°T, 2.7 nm from Westfield church spire.

   Plot the 1440 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1320 your fix is 058°T, 3.6 nm from Westfield church spire. You steer 118°T at 5.4 kn through the water. At 1355 a new fix puts you 220°T, 2.0 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1455 your fix is 338°T, 1.7 nm from Mill stack. You steer 080°T at 6.9 kn through the water. At 1535 a new fix puts you 178°T, 1.0 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1530 your fix is 204°T, 2.2 nm from Gannet Rock daybeacon. You steer 323°T at 7.5 kn through the water. At 1640 a new fix puts you 047°T, 4.2 nm from Westfield church spire.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn