Worksheet 557 · Skill 5

Set and drift

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1. At 1420 your fix is 014°T, 1.3 nm from Heron Point Light. You steer 020°T at 6.1 kn through the water. At 1500 a new fix puts you 277°T, 2.9 nm from Tern Island tower.

   Plot the 1500 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 0840 your fix is 043°T, 2.5 nm from Westfield church spire. You steer 169°T at 5.4 kn through the water. At 0925 a new fix puts you 060°T, 0.9 nm from Heron Point Light.

   Plot the 0925 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 1415 your fix is 356°T, 1.5 nm from Mill stack. You steer 072°T at 4.9 kn through the water. At 1450 a new fix puts you 229°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1450 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 0720 your fix is 023°T, 1.6 nm from Kittle water tank. You steer 277°T at 8.1 kn through the water. At 0800 a new fix puts you 354°T, 3.1 nm from Mill stack.

   Plot the 0800 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  

5. At 0950 your fix is 057°T, 3.3 nm from Tern Island tower. You steer 186°T at 8.4 kn through the water. At 1030 a new fix puts you 095°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1030 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  

6. At 1540 your fix is 064°T, 3.4 nm from Westfield church spire. You steer 165°T at 5.4 kn through the water. At 1625 a new fix puts you 316°T, 1.6 nm from Mill stack.

   Plot the 1625 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  

7. At 1200 your fix is 078°T, 3.7 nm from Westfield church spire. You steer 141°T at 6.3 kn through the water. At 1245 a new fix puts you 238°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 1245 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 1525 your fix is 018°T, 1.9 nm from Mill stack. You steer 078°T at 4.1 kn through the water. At 1655 a new fix puts you 327°T, 3.1 nm from Kittle water tank.

   Plot the 1655 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn