Worksheet 889 · Skill 5

Set and drift

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1. At 1350 your fix is 075°T, 1.7 nm from Gannet Rock daybeacon. You steer 014°T at 6.6 kn through the water. At 1420 a new fix puts you 071°T, 4.7 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1555 your fix is 306°T, 1.9 nm from Tern Island tower. You steer 220°T at 4.6 kn through the water. At 1640 a new fix puts you 239°T, 2.5 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1530 your fix is 093°T, 3.5 nm from Westfield church spire. You steer 093°T at 7.1 kn through the water. At 1625 a new fix puts you 055°T, 3.0 nm from Gannet Rock daybeacon.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0715 your fix is 310°T, 2.1 nm from Tern Island tower. You steer 190°T at 5.7 kn through the water. At 0745 a new fix puts you 229°T, 2.7 nm from Tern Island tower.

   Plot the 0745 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 1255 your fix is 016°T, 2.4 nm from Westfield church spire. You steer 083°T at 7.2 kn through the water. At 1325 a new fix puts you 293°T, 3.0 nm from Tern Island tower.

   Plot the 1325 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 0930 your fix is 067°T, 3.2 nm from Westfield church spire. You steer 069°T at 9.0 kn through the water. At 1005 a new fix puts you 003°T, 1.6 nm from Tern Island tower.

   Plot the 1005 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 048°T, 3.1 nm from Tern Island tower. You steer 268°T at 7.6 kn through the water. At 1640 a new fix puts you 050°T, 2.8 nm from Westfield church spire.

   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 0930 your fix is 342°T, 1.0 nm from Heron Point Light. You steer 001°T at 9.0 kn through the water. At 1000 a new fix puts you 042°T, 1.5 nm from Westfield church spire.

   Plot the 1000 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