Worksheet 937 · Skill 5

Set and drift

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1. At 0815 your fix is 052°T, 2.5 nm from Heron Point Light. You steer 013°T at 5.9 kn through the water. At 0850 a new fix puts you 292°T, 2.5 nm from Tern Island tower.

   Plot the 0850 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  

2. At 1120 your fix is 130°T, 1.9 nm from Westfield church spire. You steer 085°T at 6.3 kn through the water. At 1240 a new fix puts you 071°T, 3.0 nm from Gannet Rock daybeacon.

   Plot the 1240 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  

3. At 0820 your fix is 025°T, 2.6 nm from Mill stack. You steer 088°T at 5.7 kn through the water. At 0900 a new fix puts you 009°T, 1.4 nm from Kittle water tank.

   Plot the 0900 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 1200 your fix is 305°T, 3.7 nm from Tern Island tower. You steer 093°T at 4.4 kn through the water. At 1245 a new fix puts you 030°T, 2.4 nm from Tern Island tower.

   Plot the 1245 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 1535 your fix is 275°T, 1.8 nm from Gannet Rock daybeacon. You steer 050°T at 4.6 kn through the water. At 1630 a new fix puts you 072°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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1010 your fix is 320°T, 2.1 nm from Tern Island tower. You steer 103°T at 6.9 kn through the water. At 1050 a new fix puts you 056°T, 3.0 nm from Tern Island tower.

   Plot the 1050 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  

7. At 1250 your fix is 305°T, 2.5 nm from Tern Island tower. You steer 203°T at 4.1 kn through the water. At 1330 a new fix puts you 091°T, 3.3 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0755 your fix is 061°T, 2.8 nm from Heron Point Light. You steer 314°T at 7.6 kn through the water. At 0830 a new fix puts you 072°T, 2.6 nm from Westfield church spire.

   Plot the 0830 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