Worksheet 896 · Skill 5

Set and drift

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1. At 0940 your fix is 265°T, 3.4 nm from Tern Island tower. You steer 315°T at 7.8 kn through the water. At 1010 a new fix puts you 014°T, 2.7 nm from Westfield church spire.

   Plot the 1010 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 1105 your fix is 299°T, 4.1 nm from Tern Island tower. You steer 243°T at 4.2 kn through the water. At 1205 a new fix puts you 085°T, 2.0 nm from Westfield church spire.

   Plot the 1205 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  

3. At 1505 your fix is 060°T, 4.2 nm from Tern Island tower. You steer 190°T at 5.8 kn through the water. At 1545 a new fix puts you 044°T, 2.3 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1235 your fix is 024°T, 3.6 nm from Westfield church spire. You steer 097°T at 8.4 kn through the water. At 1335 a new fix puts you 056°T, 3.5 nm from Tern Island tower.

   Plot the 1335 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  

5. At 1435 your fix is 065°T, 1.8 nm from Westfield church spire. You steer 064°T at 8.8 kn through the water. At 1515 a new fix puts you 330°T, 2.6 nm from Tern Island tower.

   Plot the 1515 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 1305 your fix is 132°T, 3.3 nm from Tern Island tower. You steer 138°T at 6.2 kn through the water. At 1335 a new fix puts you 071°T, 1.5 nm from Kittle water tank.

   Plot the 1335 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  

7. At 1450 your fix is 000°T, 1.4 nm from Tern Island tower. You steer 247°T at 5.5 kn through the water. At 1540 a new fix puts you 288°T, 4.0 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1315 your fix is 343°T, 1.8 nm from Tern Island tower. You steer 251°T at 8.5 kn through the water. At 1345 a new fix puts you 062°T, 1.9 nm from Westfield church spire.

   Plot the 1345 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