Worksheet 390 · Skill 5

Set and drift

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1. At 1010 your fix is 255°T, 2.1 nm from Gannet Rock daybeacon. You steer 316°T at 5.3 kn through the water. At 1055 a new fix puts you 254°T, 3.1 nm from Tern Island tower.

   Plot the 1055 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 1215 your fix is 064°T, 2.8 nm from Westfield church spire. You steer 108°T at 4.3 kn through the water. At 1305 a new fix puts you 281°T, 2.0 nm from Tern Island tower.

   Plot the 1305 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  

3. At 1005 your fix is 047°T, 1.8 nm from Heron Point Light. You steer 012°T at 7.6 kn through the water. At 1045 a new fix puts you 050°T, 4.0 nm from Westfield church spire.

   Plot the 1045 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 1420 your fix is 232°T, 3.3 nm from Tern Island tower. You steer 358°T at 6.0 kn through the water. At 1450 a new fix puts you 281°T, 2.6 nm from Tern Island tower.

   Plot the 1450 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 1010 your fix is 331°T, 1.6 nm from Tern Island tower. You steer 072°T at 4.3 kn through the water. At 1045 a new fix puts you 030°T, 2.9 nm from Tern Island tower.

   Plot the 1045 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  

6. At 0910 your fix is 299°T, 4.2 nm from Tern Island tower. You steer 145°T at 7.4 kn through the water. At 1010 a new fix puts you 276°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1010 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 0740 your fix is 286°T, 0.8 nm from Gannet Rock daybeacon. You steer 279°T at 6.0 kn through the water. At 0820 a new fix puts you 047°T, 2.6 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1315 your fix is 044°T, 3.0 nm from Heron Point Light. You steer 306°T at 6.7 kn through the water. At 1355 a new fix puts you 028°T, 3.0 nm from Westfield church spire.

   Plot the 1355 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