Worksheet 528 · Skill 5

Set and drift

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1. At 1515 your fix is 073°T, 2.7 nm from Tern Island tower. You steer 215°T at 7.7 kn through the water. At 1610 a new fix puts you 018°T, 2.6 nm from Mill stack.

   Plot the 1610 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  

2. At 1215 your fix is 154°T, 1.8 nm from Westfield church spire. You steer 054°T at 5.9 kn through the water. At 1330 a new fix puts you 300°T, 1.3 nm from Tern Island tower.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1100 your fix is 135°T, 1.4 nm from Westfield church spire. You steer 001°T at 6.3 kn through the water. At 1140 a new fix puts you 034°T, 2.0 nm from Westfield church spire.

   Plot the 1140 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 0810 your fix is 049°T, 1.6 nm from Tern Island tower. You steer 095°T at 4.0 kn through the water. At 0850 a new fix puts you 047°T, 3.8 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0905 your fix is 007°T, 1.3 nm from Kittle water tank. You steer 033°T at 4.6 kn through the water. At 0935 a new fix puts you 093°T, 2.2 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0830 your fix is 346°T, 2.0 nm from Tern Island tower. You steer 227°T at 6.1 kn through the water. At 0930 a new fix puts you 239°T, 3.4 nm from Tern Island tower.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0700 your fix is 019°T, 1.9 nm from Heron Point Light. You steer 084°T at 7.5 kn through the water. At 0735 a new fix puts you 200°T, 2.3 nm from Tern Island tower.

   Plot the 0735 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 1540 your fix is 279°T, 3.3 nm from Tern Island tower. You steer 316°T at 4.5 kn through the water. At 1610 a new fix puts you 034°T, 3.7 nm from Westfield church spire.

   Plot the 1610 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