Worksheet 683 · Skill 5

Set and drift

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1. At 1450 your fix is 149°T, 2.4 nm from Tern Island tower. You steer 053°T at 6.1 kn through the water. At 1525 a new fix puts you 036°T, 3.3 nm from Gannet Rock daybeacon.

   Plot the 1525 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 1135 your fix is 005°T, 2.3 nm from Westfield church spire. You steer 111°T at 5.3 kn through the water. At 1205 a new fix puts you 071°T, 3.1 nm from Westfield church spire.

   Plot the 1205 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 0850 your fix is 355°T, 2.6 nm from Mill stack. You steer 087°T at 4.3 kn through the water. At 0935 a new fix puts you 281°T, 2.2 nm from Kittle water tank.

   Plot the 0935 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 0735 your fix is 012°T, 1.6 nm from Mill stack. You steer 355°T at 5.3 kn through the water. At 0855 a new fix puts you 261°T, 3.6 nm from Tern Island tower.

   Plot the 0855 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  

5. At 1040 your fix is 280°T, 3.0 nm from Tern Island tower. You steer 076°T at 4.4 kn through the water. At 1110 a new fix puts you 011°T, 1.5 nm from Tern Island tower.

   Plot the 1110 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 1515 your fix is 039°T, 2.7 nm from Gannet Rock daybeacon. You steer 252°T at 4.8 kn through the water. At 1615 a new fix puts you 188°T, 1.9 nm from Tern Island tower.

   Plot the 1615 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  

7. At 0900 your fix is 197°T, 1.8 nm from Gannet Rock daybeacon. You steer 296°T at 6.2 kn through the water. At 0930 a new fix puts you 354°T, 2.7 nm from Mill stack.

   Plot the 0930 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 1415 your fix is 084°T, 1.9 nm from Heron Point Light. You steer 324°T at 4.6 kn through the water. At 1515 a new fix puts you 086°T, 2.3 nm from Westfield church spire.

   Plot the 1515 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