Worksheet 85 · Skill 5

Set and drift

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1. At 0750 your fix is 301°T, 1.8 nm from Kittle water tank. You steer 292°T at 4.2 kn through the water. At 0910 a new fix puts you 228°T, 2.4 nm from Tern Island tower.

   Plot the 0910 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  

2. At 1535 your fix is 284°T, 1.6 nm from Tern Island tower. You steer 279°T at 5.6 kn through the water. At 1605 a new fix puts you 291°T, 3.3 nm from Tern Island tower.

   Plot the 1605 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  

3. At 0955 your fix is 084°T, 1.0 nm from Heron Point Light. You steer 067°T at 8.5 kn through the water. At 1055 a new fix puts you 085°T, 3.1 nm from Gannet Rock daybeacon.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1015 your fix is 014°T, 1.7 nm from Mill stack. You steer 303°T at 7.4 kn through the water. At 1100 a new fix puts you 346°T, 1.4 nm from Heron Point Light.

   Plot the 1100 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 1345 your fix is 124°T, 1.4 nm from Westfield church spire. You steer 042°T at 4.5 kn through the water. At 1415 a new fix puts you 056°T, 2.0 nm from Westfield church spire.

   Plot the 1415 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 1030 your fix is 018°T, 3.0 nm from Westfield church spire. You steer 118°T at 4.0 kn through the water. At 1150 a new fix puts you 211°T, 2.6 nm from Tern Island tower.

   Plot the 1150 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  

7. At 0905 your fix is 064°T, 3.3 nm from Tern Island tower. You steer 271°T at 5.3 kn through the water. At 0940 a new fix puts you 017°T, 1.7 nm from Tern Island tower.

   Plot the 0940 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  

8. At 0740 your fix is 292°T, 2.9 nm from Tern Island tower. You steer 229°T at 7.6 kn through the water. At 0810 a new fix puts you 120°T, 1.3 nm from Westfield church spire.

   Plot the 0810 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