Worksheet 753 · Skill 5

Set and drift

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1. At 1230 your fix is 196°T, 2.3 nm from Tern Island tower. You steer 071°T at 8.3 kn through the water. At 1310 a new fix puts you 043°T, 3.8 nm from Gannet Rock daybeacon.

   Plot the 1310 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  

2. At 1315 your fix is 342°T, 2.1 nm from Tern Island tower. You steer 242°T at 5.0 kn through the water. At 1345 a new fix puts you 293°T, 4.1 nm from Tern Island tower.

   Plot the 1345 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 1520 your fix is 089°T, 2.3 nm from Gannet Rock daybeacon. You steer 170°T at 5.1 kn through the water. At 1550 a new fix puts you 040°T, 2.3 nm from Kittle water tank.

   Plot the 1550 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  

4. At 1145 your fix is 212°T, 2.9 nm from Tern Island tower. You steer 286°T at 4.4 kn through the water. At 1215 a new fix puts you 235°T, 3.1 nm from Tern Island tower.

   Plot the 1215 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 0855 your fix is 086°T, 2.9 nm from Gannet Rock daybeacon. You steer 254°T at 8.3 kn through the water. At 0945 a new fix puts you 031°T, 2.6 nm from Mill stack.

   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  

6. At 1530 your fix is 252°T, 2.6 nm from Tern Island tower. You steer 178°T at 6.7 kn through the water. At 1600 a new fix puts you 343°T, 2.8 nm from Mill stack.

   Plot the 1600 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  

7. At 0725 your fix is 042°T, 2.3 nm from Kittle water tank. You steer 331°T at 5.4 kn through the water. At 0805 a new fix puts you 041°T, 3.2 nm from Gannet Rock daybeacon.

   Plot the 0805 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 0825 your fix is 074°T, 1.6 nm from Westfield church spire. You steer 086°T at 4.7 kn through the water. At 0920 a new fix puts you 281°T, 1.5 nm from Tern Island tower.

   Plot the 0920 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