Worksheet 700 · Skill 5

Set and drift

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1. At 0705 your fix is 023°T, 2.1 nm from Mill stack. You steer 334°T at 5.9 kn through the water. At 0805 a new fix puts you 056°T, 2.0 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1525 your fix is 061°T, 3.2 nm from Gannet Rock daybeacon. You steer 298°T at 5.8 kn through the water. At 1610 a new fix puts you 019°T, 1.3 nm from Tern Island tower.

   Plot the 1610 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 1015 your fix is 044°T, 4.3 nm from Westfield church spire. You steer 189°T at 5.1 kn through the water. At 1055 a new fix puts you 039°T, 3.4 nm from Heron Point Light.

   Plot the 1055 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 0735 your fix is 029°T, 1.7 nm from Gannet Rock daybeacon. You steer 251°T at 5.5 kn through the water. At 0845 a new fix puts you 213°T, 3.2 nm from Tern Island tower.

   Plot the 0845 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  

5. At 0730 your fix is 093°T, 1.6 nm from Gannet Rock daybeacon. You steer 224°T at 5.4 kn through the water. At 0805 a new fix puts you 226°T, 2.1 nm from Gannet Rock daybeacon.

   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  

6. At 1540 your fix is 008°T, 2.7 nm from Mill stack. You steer 314°T at 4.1 kn through the water. At 1655 a new fix puts you 062°T, 3.3 nm from Westfield church spire.

   Plot the 1655 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1410 your fix is 017°T, 1.9 nm from Mill stack. You steer 344°T at 4.4 kn through the water. At 1500 a new fix puts you 281°T, 3.5 nm from Tern Island tower.

   Plot the 1500 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 0820 your fix is 018°T, 2.7 nm from Mill stack. You steer 077°T at 7.3 kn through the water. At 0905 a new fix puts you 097°T, 2.9 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn