Worksheet 236 · Skill 5

Set and drift

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1. At 1325 your fix is 309°T, 3.8 nm from Tern Island tower. You steer 096°T at 9.0 kn through the water. At 1400 a new fix puts you 055°T, 3.6 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1035 your fix is 342°T, 2.3 nm from Tern Island tower. You steer 104°T at 4.9 kn through the water. At 1130 a new fix puts you 063°T, 3.0 nm from Tern Island tower.

   Plot the 1130 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 0730 your fix is 118°T, 1.6 nm from Tern Island tower. You steer 218°T at 6.2 kn through the water. At 0810 a new fix puts you 344°T, 1.7 nm from Mill stack.

   Plot the 0810 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  

4. At 0905 your fix is 094°T, 2.6 nm from Westfield church spire. You steer 186°T at 4.2 kn through the water. At 0940 a new fix puts you 065°T, 2.0 nm from Heron Point Light.

   Plot the 0940 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 1230 your fix is 237°T, 2.3 nm from Tern Island tower. You steer 179°T at 5.5 kn through the water. At 1305 a new fix puts you 334°T, 1.5 nm from Mill stack.

   Plot the 1305 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 1055 your fix is 300°T, 1.1 nm from Gannet Rock daybeacon. You steer 304°T at 7.9 kn through the water. At 1155 a new fix puts you 025°T, 3.1 nm from Westfield church spire.

   Plot the 1155 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  

7. At 1435 your fix is 043°T, 2.9 nm from Gannet Rock daybeacon. You steer 237°T at 8.2 kn through the water. At 1520 a new fix puts you 334°T, 1.4 nm from Mill stack.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1140 your fix is 261°T, 2.9 nm from Tern Island tower. You steer 181°T at 4.1 kn through the water. At 1240 a new fix puts you 340°T, 2.6 nm from Mill stack.

   Plot the 1240 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