Worksheet 934 · Skill 5

Set and drift

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1. At 1015 your fix is 012°T, 1.1 nm from Gannet Rock daybeacon. You steer 243°T at 7.9 kn through the water. At 1100 a new fix puts you 073°T, 1.9 nm from Heron Point Light.

   Plot the 1100 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  

2. At 1505 your fix is 046°T, 3.1 nm from Gannet Rock daybeacon. You steer 303°T at 4.2 kn through the water. At 1555 a new fix puts you 001°T, 1.7 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1515 your fix is 243°T, 3.2 nm from Tern Island tower. You steer 307°T at 5.3 kn through the water. At 1600 a new fix puts you 047°T, 1.3 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1340 your fix is 064°T, 2.3 nm from Heron Point Light. You steer 012°T at 8.6 kn through the water. At 1415 a new fix puts you 332°T, 2.7 nm from Tern Island tower.

   Plot the 1415 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 1235 your fix is 004°T, 1.9 nm from Mill stack. You steer 327°T at 4.7 kn through the water. At 1345 a new fix puts you 032°T, 1.7 nm from Westfield church spire.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1100 your fix is 350°T, 2.0 nm from Heron Point Light. You steer 055°T at 6.7 kn through the water. At 1220 a new fix puts you 019°T, 2.5 nm from Tern Island tower.

   Plot the 1220 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1405 your fix is 020°T, 2.0 nm from Mill stack. You steer 297°T at 5.5 kn through the water. At 1505 a new fix puts you 017°T, 1.6 nm from Westfield church spire.

   Plot the 1505 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 1135 your fix is 056°T, 1.7 nm from Westfield church spire. You steer 126°T at 6.7 kn through the water. At 1230 a new fix puts you 340°T, 2.5 nm from Mill stack.

   Plot the 1230 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