Worksheet 871 · Skill 5

Set and drift

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1. At 0845 your fix is 218°T, 2.8 nm from Tern Island tower. You steer 304°T at 7.7 kn through the water. At 0930 a new fix puts you 058°T, 2.7 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0905 your fix is 037°T, 1.9 nm from Heron Point Light. You steer 030°T at 4.1 kn through the water. At 0935 a new fix puts you 051°T, 3.4 nm from Heron Point Light.

   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  

3. At 1305 your fix is 053°T, 2.3 nm from Heron Point Light. You steer 105°T at 5.7 kn through the water. At 1335 a new fix puts you 040°T, 2.4 nm from Mill stack.

   Plot the 1335 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 1450 your fix is 327°T, 1.7 nm from Tern Island tower. You steer 212°T at 8.3 kn through the water. At 1530 a new fix puts you 100°T, 1.9 nm from Heron Point Light.

   Plot the 1530 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 1330 your fix is 016°T, 2.0 nm from Mill stack. You steer 044°T at 8.8 kn through the water. At 1420 a new fix puts you 054°T, 3.9 nm from Tern Island tower.

   Plot the 1420 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 0735 your fix is 242°T, 2.5 nm from Gannet Rock daybeacon. You steer 340°T at 7.5 kn through the water. At 0820 a new fix puts you 296°T, 3.4 nm from Tern Island tower.

   Plot the 0820 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 1105 your fix is 060°T, 2.6 nm from Tern Island tower. You steer 151°T at 4.5 kn through the water. At 1145 a new fix puts you 048°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 1145 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 1000 your fix is 207°T, 2.2 nm from Tern Island tower. You steer 263°T at 7.4 kn through the water. At 1030 a new fix puts you 043°T, 1.7 nm from Heron Point Light.

   Plot the 1030 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