Worksheet 808 · Skill 5

Set and drift

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1. At 1245 your fix is 301°T, 3.8 nm from Tern Island tower. You steer 151°T at 7.3 kn through the water. At 1320 a new fix puts you 227°T, 2.1 nm from Tern Island tower.

   Plot the 1320 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 1315 your fix is 060°T, 3.2 nm from Westfield church spire. You steer 146°T at 4.6 kn through the water. At 1430 a new fix puts you 086°T, 1.5 nm from Heron Point Light.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1515 your fix is 113°T, 2.1 nm from Gannet Rock daybeacon. You steer 031°T at 4.3 kn through the water. At 1545 a new fix puts you 064°T, 3.3 nm from Gannet Rock daybeacon.

   Plot the 1545 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 0815 your fix is 021°T, 2.7 nm from Westfield church spire. You steer 147°T at 6.6 kn through the water. At 0850 a new fix puts you 093°T, 3.4 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1230 your fix is 095°T, 2.8 nm from Westfield church spire. You steer 054°T at 5.0 kn through the water. At 1300 a new fix puts you 297°T, 1.9 nm from Tern Island tower.

   Plot the 1300 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  

6. At 0745 your fix is 304°T, 4.0 nm from Tern Island tower. You steer 198°T at 5.5 kn through the water. At 0845 a new fix puts you 039°T, 1.7 nm from Heron Point Light.

   Plot the 0845 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 1510 your fix is 046°T, 4.4 nm from Westfield church spire. You steer 122°T at 5.5 kn through the water. At 1540 a new fix puts you 274°T, 3.0 nm from Tern Island tower.

   Plot the 1540 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  

8. At 1105 your fix is 063°T, 4.8 nm from Tern Island tower. You steer 184°T at 5.9 kn through the water. At 1140 a new fix puts you 048°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1140 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