Worksheet 432 · Skill 5

Set and drift

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1. At 1320 your fix is 058°T, 1.9 nm from Heron Point Light. You steer 067°T at 8.6 kn through the water. At 1420 a new fix puts you 357°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1420 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  

2. At 1555 your fix is 354°T, 0.9 nm from Kittle water tank. You steer 306°T at 7.2 kn through the water. At 1705 a new fix puts you 034°T, 2.4 nm from Westfield church spire.

   Plot the 1705 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1550 your fix is 006°T, 1.6 nm from Gannet Rock daybeacon. You steer 149°T at 7.1 kn through the water. At 1630 a new fix puts you 037°T, 0.9 nm from Kittle water tank.

   Plot the 1630 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 1335 your fix is 104°T, 1.5 nm from Tern Island tower. You steer 225°T at 7.2 kn through the water. At 1405 a new fix puts you 242°T, 2.5 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1420 your fix is 356°T, 0.9 nm from Gannet Rock daybeacon. You steer 119°T at 6.1 kn through the water. At 1450 a new fix puts you 077°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1450 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 1300 your fix is 255°T, 3.0 nm from Tern Island tower. You steer 125°T at 4.9 kn through the water. At 1330 a new fix puts you 268°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 1330 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 0710 your fix is 247°T, 3.1 nm from Tern Island tower. You steer 110°T at 4.0 kn through the water. At 0740 a new fix puts you 278°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 0740 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 0730 your fix is 292°T, 3.9 nm from Tern Island tower. You steer 281°T at 4.9 kn through the water. At 0805 a new fix puts you 019°T, 2.8 nm from Westfield church spire.

   Plot the 0805 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