Worksheet 788 · Skill 5

Set and drift

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1. At 1450 your fix is 140°T, 1.3 nm from Tern Island tower. You steer 110°T at 5.2 kn through the water. At 1540 a new fix puts you 077°T, 2.7 nm from Gannet Rock daybeacon.

   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  

2. At 0925 your fix is 313°T, 3.4 nm from Tern Island tower. You steer 175°T at 4.9 kn through the water. At 1010 a new fix puts you 083°T, 3.7 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1220 your fix is 259°T, 2.4 nm from Tern Island tower. You steer 209°T at 4.1 kn through the water. At 1305 a new fix puts you 048°T, 3.0 nm from Heron Point Light.

   Plot the 1305 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  

4. At 1550 your fix is 111°T, 1.4 nm from Gannet Rock daybeacon. You steer 003°T at 6.5 kn through the water. At 1640 a new fix puts you 031°T, 3.7 nm from Gannet Rock daybeacon.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1400 your fix is 344°T, 1.4 nm from Tern Island tower. You steer 084°T at 6.1 kn through the water. At 1430 a new fix puts you 068°T, 3.2 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1510 your fix is 323°T, 1.4 nm from Gannet Rock daybeacon. You steer 252°T at 6.5 kn through the water. At 1545 a new fix puts you 057°T, 3.0 nm from Heron Point Light.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1450 your fix is 038°T, 2.2 nm from Heron Point Light. You steer 034°T at 5.1 kn through the water. At 1520 a new fix puts you 268°T, 3.1 nm from Tern Island tower.

   Plot the 1520 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 1545 your fix is 041°T, 2.3 nm from Tern Island tower. You steer 263°T at 4.3 kn through the water. At 1630 a new fix puts you 310°T, 3.3 nm from Tern Island tower.

   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