Worksheet 854 · Skill 5

Set and drift

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1. At 1100 your fix is 005°T, 1.6 nm from Kittle water tank. You steer 290°T at 8.8 kn through the water. At 1135 a new fix puts you 213°T, 3.0 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  

2. At 1525 your fix is 074°T, 1.7 nm from Heron Point Light. You steer 041°T at 4.0 kn through the water. At 1620 a new fix puts you 273°T, 2.9 nm from Tern Island tower.

   Plot the 1620 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  

3. At 1555 your fix is 159°T, 1.4 nm from Tern Island tower. You steer 229°T at 4.8 kn through the water. At 1640 a new fix puts you 048°T, 3.0 nm from Heron Point Light.

   Plot the 1640 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 1305 your fix is 037°T, 2.4 nm from Heron Point Light. You steer 312°T at 5.2 kn through the water. At 1335 a new fix puts you 068°T, 2.3 nm from Westfield church spire.

   Plot the 1335 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  

5. At 1035 your fix is 286°T, 1.7 nm from Tern Island tower. You steer 157°T at 4.4 kn through the water. At 1135 a new fix puts you 214°T, 3.2 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0915 your fix is 058°T, 4.4 nm from Tern Island tower. You steer 190°T at 5.3 kn through the water. At 0950 a new fix puts you 048°T, 2.8 nm from Gannet Rock daybeacon.

   Plot the 0950 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 1350 your fix is 052°T, 2.9 nm from Westfield church spire. You steer 173°T at 6.1 kn through the water. At 1435 a new fix puts you 033°T, 2.0 nm from Heron Point Light.

   Plot the 1435 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  

8. At 1010 your fix is 017°T, 1.1 nm from Gannet Rock daybeacon. You steer 238°T at 6.6 kn through the water. At 1050 a new fix puts you 220°T, 2.9 nm from Tern Island tower.

   Plot the 1050 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