Worksheet 817 · Skill 5

Set and drift

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1. At 1305 your fix is 223°T, 1.4 nm from Tern Island tower. You steer 242°T at 6.5 kn through the water. At 1345 a new fix puts you 332°T, 1.8 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0825 your fix is 040°T, 4.4 nm from Westfield church spire. You steer 134°T at 5.2 kn through the water. At 0940 a new fix puts you 199°T, 1.4 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1215 your fix is 088°T, 3.3 nm from Westfield church spire. You steer 147°T at 7.8 kn through the water. At 1250 a new fix puts you 358°T, 1.9 nm from Mill stack.

   Plot the 1250 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  

4. At 1225 your fix is 092°T, 1.9 nm from Gannet Rock daybeacon. You steer 349°T at 4.4 kn through the water. At 1310 a new fix puts you 046°T, 1.9 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0910 your fix is 073°T, 3.4 nm from Westfield church spire. You steer 201°T at 4.3 kn through the water. At 0950 a new fix puts you 120°T, 2.0 nm from Westfield church spire.

   Plot the 0950 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  

6. At 1600 your fix is 302°T, 2.2 nm from Tern Island tower. You steer 185°T at 8.6 kn through the water. At 1645 a new fix puts you 342°T, 1.9 nm from Mill stack.

   Plot the 1645 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 1400 your fix is 103°T, 2.5 nm from Westfield church spire. You steer 125°T at 4.1 kn through the water. At 1520 a new fix puts you 334°T, 2.6 nm from Kittle water tank.

   Plot the 1520 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  

8. At 1035 your fix is 308°T, 1.1 nm from Gannet Rock daybeacon. You steer 292°T at 7.6 kn through the water. At 1120 a new fix puts you 058°T, 3.3 nm from Westfield church spire.

   Plot the 1120 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