Worksheet 542 · Skill 5

Set and drift

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1. At 1305 your fix is 228°T, 3.2 nm from Tern Island tower. You steer 333°T at 5.0 kn through the water. At 1400 a new fix puts you 304°T, 3.3 nm from Tern Island tower.

   Plot the 1400 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 1420 your fix is 323°T, 3.0 nm from Tern Island tower. You steer 216°T at 8.2 kn through the water. At 1505 a new fix puts you 140°T, 1.4 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1120 your fix is 024°T, 2.6 nm from Mill stack. You steer 094°T at 4.1 kn through the water. At 1155 a new fix puts you 192°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 1155 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  

4. At 1240 your fix is 009°T, 2.4 nm from Heron Point Light. You steer 110°T at 4.6 kn through the water. At 1405 a new fix puts you 017°T, 2.2 nm from Mill stack.

   Plot the 1405 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  

5. At 1430 your fix is 022°T, 2.0 nm from Westfield church spire. You steer 092°T at 6.1 kn through the water. At 1515 a new fix puts you 312°T, 3.2 nm from Tern Island tower.

   Plot the 1515 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  

6. At 1255 your fix is 011°T, 3.0 nm from Mill stack. You steer 349°T at 6.4 kn through the water. At 1345 a new fix puts you 303°T, 4.7 nm from Tern Island tower.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1505 your fix is 203°T, 2.8 nm from Tern Island tower. You steer 288°T at 6.7 kn through the water. At 1535 a new fix puts you 014°T, 2.6 nm from Heron Point Light.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1235 your fix is 081°T, 1.2 nm from Heron Point Light. You steer 058°T at 8.1 kn through the water. At 1320 a new fix puts you 017°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 1320 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