Worksheet 370 · Skill 5

Set and drift

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1. At 0740 your fix is 269°T, 2.7 nm from Tern Island tower. You steer 297°T at 6.4 kn through the water. At 0820 a new fix puts you 012°T, 2.8 nm from Westfield church spire.

   Plot the 0820 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  

2. At 1415 your fix is 052°T, 4.2 nm from Westfield church spire. You steer 134°T at 5.3 kn through the water. At 1505 a new fix puts you 228°T, 1.4 nm from Tern Island tower.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1430 your fix is 133°T, 1.7 nm from Westfield church spire. You steer 077°T at 4.8 kn through the water. At 1515 a new fix puts you 033°T, 3.6 nm from Heron Point Light.

   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  

4. At 1225 your fix is 271°T, 1.8 nm from Tern Island tower. You steer 157°T at 6.9 kn through the water. At 1310 a new fix puts you 015°T, 2.1 nm from Mill stack.

   Plot the 1310 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  

5. At 0730 your fix is 031°T, 2.9 nm from Westfield church spire. You steer 078°T at 5.0 kn through the water. At 0830 a new fix puts you 033°T, 1.5 nm from Tern Island tower.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1510 your fix is 034°T, 2.7 nm from Heron Point Light. You steer 346°T at 4.9 kn through the water. At 1540 a new fix puts you 089°T, 3.2 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0705 your fix is 042°T, 2.3 nm from Heron Point Light. You steer 100°T at 6.4 kn through the water. At 0825 a new fix puts you 007°T, 1.1 nm from Kittle water tank.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1145 your fix is 017°T, 0.9 nm from Westfield church spire. You steer 104°T at 7.0 kn through the water. At 1225 a new fix puts you 043°T, 2.8 nm from Heron Point Light.

   Plot the 1225 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