Worksheet 539 · Skill 5

Set and drift

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1. At 1120 your fix is 066°T, 3.6 nm from Westfield church spire. You steer 183°T at 5.0 kn through the water. At 1150 a new fix puts you 018°T, 2.5 nm from Heron Point Light.

   Plot the 1150 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 0820 your fix is 093°T, 3.3 nm from Westfield church spire. You steer 302°T at 4.8 kn through the water. At 0850 a new fix puts you 065°T, 1.9 nm from Westfield church spire.

   Plot the 0850 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  

3. At 1530 your fix is 283°T, 2.1 nm from Tern Island tower. You steer 256°T at 7.9 kn through the water. At 1600 a new fix puts you 048°T, 2.0 nm from Westfield church spire.

   Plot the 1600 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  

4. At 1400 your fix is 024°T, 3.3 nm from Westfield church spire. You steer 119°T at 8.8 kn through the water. At 1430 a new fix puts you 276°T, 2.7 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0805 your fix is 047°T, 1.6 nm from Westfield church spire. You steer 148°T at 7.2 kn through the water. At 0840 a new fix puts you 322°T, 2.0 nm from Mill stack.

   Plot the 0840 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  

6. At 0840 your fix is 247°T, 1.9 nm from Tern Island tower. You steer 309°T at 5.8 kn through the water. At 0920 a new fix puts you 040°T, 4.6 nm from Westfield church spire.

   Plot the 0920 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  

7. At 1515 your fix is 030°T, 3.0 nm from Westfield church spire. You steer 129°T at 7.0 kn through the water. At 1605 a new fix puts you 060°T, 3.2 nm from Heron Point Light.

   Plot the 1605 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 0830 your fix is 094°T, 2.7 nm from Westfield church spire. You steer 111°T at 7.0 kn through the water. At 0955 a new fix puts you 036°T, 1.7 nm from Kittle water tank.

   Plot the 0955 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