Worksheet 583 · Skill 5

Set and drift

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1. At 1425 your fix is 312°T, 2.7 nm from Tern Island tower. You steer 206°T at 4.8 kn through the water. At 1520 a new fix puts you 215°T, 3.1 nm from Tern Island tower.

   Plot the 1520 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  

2. At 1520 your fix is 046°T, 4.3 nm from Westfield church spire. You steer 130°T at 6.4 kn through the water. At 1605 a new fix puts you 255°T, 1.7 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1440 your fix is 267°T, 1.0 nm from Gannet Rock daybeacon. You steer 236°T at 4.4 kn through the water. At 1510 a new fix puts you 007°T, 2.4 nm from Mill stack.

   Plot the 1510 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 1140 your fix is 059°T, 2.9 nm from Westfield church spire. You steer 119°T at 5.4 kn through the water. At 1210 a new fix puts you 247°T, 1.9 nm from Tern Island tower.

   Plot the 1210 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 0815 your fix is 143°T, 1.7 nm from Westfield church spire. You steer 098°T at 6.4 kn through the water. At 0915 a new fix puts you 267°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 0915 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 0940 your fix is 297°T, 3.3 nm from Tern Island tower. You steer 202°T at 8.7 kn through the water. At 1015 a new fix puts you 008°T, 1.1 nm from Heron Point Light.

   Plot the 1015 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 0920 your fix is 201°T, 2.8 nm from Tern Island tower. You steer 292°T at 6.5 kn through the water. At 0955 a new fix puts you 075°T, 2.8 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1310 your fix is 037°T, 1.3 nm from Westfield church spire. You steer 117°T at 7.7 kn through the water. At 1400 a new fix puts you 209°T, 3.0 nm from Tern Island tower.

   Plot the 1400 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