Worksheet 742 · Skill 5

Set and drift

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1. At 0730 your fix is 348°T, 1.4 nm from Tern Island tower. You steer 274°T at 7.3 kn through the water. At 0825 a new fix puts you 002°T, 2.3 nm from Westfield church spire.

   Plot the 0825 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  

2. At 1515 your fix is 096°T, 1.7 nm from Westfield church spire. You steer 062°T at 8.9 kn through the water. At 1550 a new fix puts you 347°T, 2.1 nm from Tern Island tower.

   Plot the 1550 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  

3. At 0725 your fix is 289°T, 2.2 nm from Tern Island tower. You steer 234°T at 6.8 kn through the water. At 0755 a new fix puts you 071°T, 2.4 nm from Westfield church spire.

   Plot the 0755 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  

4. At 1530 your fix is 220°T, 2.1 nm from Gannet Rock daybeacon. You steer 308°T at 7.4 kn through the water. At 1640 a new fix puts you 008°T, 2.8 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  

5. At 0800 your fix is 250°T, 3.0 nm from Tern Island tower. You steer 267°T at 7.1 kn through the water. At 0830 a new fix puts you 099°T, 1.6 nm from Westfield church spire.

   Plot the 0830 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  

6. At 1420 your fix is 258°T, 2.8 nm from Tern Island tower. You steer 118°T at 4.1 kn through the water. At 1530 a new fix puts you 267°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1530 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  

7. At 0935 your fix is 070°T, 2.7 nm from Gannet Rock daybeacon. You steer 211°T at 4.7 kn through the water. At 1005 a new fix puts you 342°T, 3.0 nm from Kittle water tank.

   Plot the 1005 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 1415 your fix is 345°T, 2.6 nm from Tern Island tower. You steer 254°T at 7.0 kn through the water. At 1500 a new fix puts you 034°T, 3.0 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn