Worksheet 689 · Skill 5

Set and drift

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1. At 1550 your fix is 058°T, 3.7 nm from Tern Island tower. You steer 154°T at 5.6 kn through the water. At 1620 a new fix puts you 051°T, 4.0 nm from Gannet Rock daybeacon.

   Plot the 1620 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 1155 your fix is 295°T, 4.2 nm from Tern Island tower. You steer 132°T at 5.5 kn through the water. At 1300 a new fix puts you 188°T, 1.5 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1325 your fix is 349°T, 3.0 nm from Mill stack. You steer 103°T at 4.8 kn through the water. At 1415 a new fix puts you 192°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 1415 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  

4. At 1305 your fix is 137°T, 2.7 nm from Tern Island tower. You steer 098°T at 4.2 kn through the water. At 1335 a new fix puts you 096°T, 2.7 nm from Gannet Rock daybeacon.

   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  

5. At 0915 your fix is 032°T, 2.1 nm from Tern Island tower. You steer 277°T at 6.1 kn through the water. At 0955 a new fix puts you 290°T, 3.4 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0830 your fix is 305°T, 2.6 nm from Tern Island tower. You steer 089°T at 7.7 kn through the water. At 0905 a new fix puts you 072°T, 2.8 nm from Tern Island tower.

   Plot the 0905 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 1540 your fix is 350°T, 1.6 nm from Kittle water tank. You steer 291°T at 9.0 kn through the water. At 1640 a new fix puts you 285°T, 3.8 nm from Tern Island tower.

   Plot the 1640 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  

8. At 1315 your fix is 031°T, 1.7 nm from Westfield church spire. You steer 109°T at 5.6 kn through the water. At 1405 a new fix puts you 248°T, 3.4 nm from Tern Island tower.

   Plot the 1405 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