Worksheet 708 · Skill 5

Set and drift

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1. At 0725 your fix is 356°T, 2.4 nm from Mill stack. You steer 355°T at 6.0 kn through the water. At 0755 a new fix puts you 268°T, 2.1 nm from Tern Island tower.

   Plot the 0755 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 1540 your fix is 085°T, 2.3 nm from Gannet Rock daybeacon. You steer 324°T at 5.7 kn through the water. At 1615 a new fix puts you 095°T, 2.2 nm from Tern Island tower.

   Plot the 1615 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  

3. At 1535 your fix is 067°T, 2.8 nm from Heron Point Light. You steer 325°T at 5.4 kn through the water. At 1625 a new fix puts you 014°T, 1.3 nm from Westfield church spire.

   Plot the 1625 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 1545 your fix is 345°T, 1.5 nm from Gannet Rock daybeacon. You steer 242°T at 7.1 kn through the water. At 1630 a new fix puts you 077°T, 2.3 nm from Heron Point Light.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1315 your fix is 065°T, 2.4 nm from Gannet Rock daybeacon. You steer 265°T at 5.7 kn through the water. At 1350 a new fix puts you 159°T, 1.1 nm from Tern Island tower.

   Plot the 1350 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 1030 your fix is 153°T, 1.2 nm from Westfield church spire. You steer 055°T at 4.3 kn through the water. At 1125 a new fix puts you 282°T, 3.8 nm from Tern Island tower.

   Plot the 1125 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  

7. At 1520 your fix is 105°T, 1.8 nm from Gannet Rock daybeacon. You steer 261°T at 5.6 kn through the water. At 1640 a new fix puts you 325°T, 1.3 nm from Mill stack.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1255 your fix is 254°T, 3.6 nm from Tern Island tower. You steer 170°T at 6.2 kn through the water. At 1330 a new fix puts you 011°T, 1.2 nm from Mill stack.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn