Worksheet 678 · Skill 5

Set and drift

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1. At 0855 your fix is 078°T, 3.7 nm from Tern Island tower. You steer 194°T at 4.5 kn through the water. At 0945 a new fix puts you 315°T, 1.5 nm from Kittle water tank.

   Plot the 0945 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 1125 your fix is 024°T, 2.1 nm from Kittle water tank. You steer 268°T at 9.0 kn through the water. At 1210 a new fix puts you 343°T, 2.1 nm from Mill stack.

   Plot the 1210 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 220°T, 2.9 nm from Tern Island tower. You steer 085°T at 8.5 kn through the water. At 1100 a new fix puts you 063°T, 2.5 nm from Gannet Rock daybeacon.

   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  

4. At 1345 your fix is 305°T, 3.3 nm from Tern Island tower. You steer 263°T at 4.4 kn through the water. At 1415 a new fix puts you 050°T, 3.4 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  

5. At 1110 your fix is 292°T, 3.3 nm from Tern Island tower. You steer 147°T at 4.8 kn through the water. At 1220 a new fix puts you 282°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 1220 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  

6. At 1520 your fix is 046°T, 3.2 nm from Gannet Rock daybeacon. You steer 219°T at 4.0 kn through the water. At 1605 a new fix puts you 157°T, 1.3 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0845 your fix is 081°T, 1.6 nm from Tern Island tower. You steer 143°T at 9.0 kn through the water. At 0915 a new fix puts you 086°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 0915 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 1500 your fix is 135°T, 2.4 nm from Tern Island tower. You steer 107°T at 4.0 kn through the water. At 1540 a new fix puts you 023°T, 1.7 nm from Kittle water tank.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn