Worksheet 702 · Skill 5

Set and drift

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1. At 1130 your fix is 025°T, 1.7 nm from Heron Point Light. You steer 107°T at 4.1 kn through the water. At 1255 a new fix puts you 041°T, 1.8 nm from Kittle water tank.

   Plot the 1255 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1300 your fix is 210°T, 2.9 nm from Tern Island tower. You steer 082°T at 7.1 kn through the water. At 1345 a new fix puts you 071°T, 3.0 nm from Gannet Rock daybeacon.

   Plot the 1345 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  

3. At 1455 your fix is 349°T, 3.0 nm from Mill stack. You steer 328°T at 6.2 kn through the water. At 1540 a new fix puts you 050°T, 1.8 nm from Westfield church spire.

   Plot the 1540 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 1515 your fix is 240°T, 2.9 nm from Tern Island tower. You steer 349°T at 6.0 kn through the water. At 1550 a new fix puts you 284°T, 3.8 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  

5. At 0915 your fix is 001°T, 0.9 nm from Gannet Rock daybeacon. You steer 257°T at 8.0 kn through the water. At 1010 a new fix puts you 160°T, 1.9 nm from Westfield church spire.

   Plot the 1010 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 1215 your fix is 094°T, 1.1 nm from Heron Point Light. You steer 329°T at 5.0 kn through the water. At 1250 a new fix puts you 146°T, 1.5 nm from Westfield church spire.

   Plot the 1250 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 1230 your fix is 251°T, 1.9 nm from Gannet Rock daybeacon. You steer 325°T at 5.3 kn through the water. At 1330 a new fix puts you 299°T, 3.8 nm from Tern Island tower.

   Plot the 1330 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1230 your fix is 346°T, 2.2 nm from Mill stack. You steer 289°T at 4.8 kn through the water. At 1300 a new fix puts you 017°T, 1.4 nm from Heron Point Light.

   Plot the 1300 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