Worksheet 342 · Skill 5

Set and drift

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1. At 0700 your fix is 053°T, 3.2 nm from Tern Island tower. You steer 181°T at 4.2 kn through the water. At 0730 a new fix puts you 093°T, 2.0 nm from Tern Island tower.

   Plot the 0730 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  

2. At 1345 your fix is 087°T, 1.1 nm from Heron Point Light. You steer 034°T at 5.0 kn through the water. At 1430 a new fix puts you 242°T, 1.8 nm from Tern Island tower.

   Plot the 1430 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 0940 your fix is 303°T, 2.6 nm from Tern Island tower. You steer 080°T at 4.1 kn through the water. At 1035 a new fix puts you 066°T, 2.4 nm from Tern Island tower.

   Plot the 1035 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  

4. At 1345 your fix is 272°T, 2.1 nm from Tern Island tower. You steer 286°T at 4.9 kn through the water. At 1420 a new fix puts you 069°T, 3.3 nm from Westfield church spire.

   Plot the 1420 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 1305 your fix is 307°T, 2.3 nm from Tern Island tower. You steer 208°T at 7.4 kn through the water. At 1350 a new fix puts you 017°T, 1.6 nm from Heron Point Light.

   Plot the 1350 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 1200 your fix is 074°T, 2.3 nm from Heron Point Light. You steer 007°T at 6.2 kn through the water. At 1255 a new fix puts you 312°T, 2.6 nm from Tern Island tower.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1600 your fix is 037°T, 2.5 nm from Westfield church spire. You steer 192°T at 4.2 kn through the water. At 1650 a new fix puts you 103°T, 2.3 nm from Westfield church spire.

   Plot the 1650 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  

8. At 1100 your fix is 359°T, 1.9 nm from Tern Island tower. You steer 117°T at 4.4 kn through the water. At 1135 a new fix puts you 060°T, 1.7 nm from Tern Island tower.

   Plot the 1135 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