Worksheet 312 · Skill 5

Set and drift

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1. At 1210 your fix is 238°T, 1.7 nm from Tern Island tower. You steer 250°T at 4.5 kn through the water. At 1315 a new fix puts you 158°T, 1.2 nm from Westfield church spire.

   Plot the 1315 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1530 your fix is 290°T, 2.3 nm from Tern Island tower. You steer 268°T at 4.4 kn through the water. At 1615 a new fix puts you 035°T, 1.9 nm from Westfield church spire.

   Plot the 1615 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  

3. At 1420 your fix is 355°T, 2.5 nm from Mill stack. You steer 310°T at 6.4 kn through the water. At 1520 a new fix puts you 005°T, 2.6 nm from Westfield church spire.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1415 your fix is 321°T, 1.8 nm from Tern Island tower. You steer 246°T at 4.8 kn through the water. At 1525 a new fix puts you 058°T, 3.7 nm from Westfield church spire.

   Plot the 1525 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0800 your fix is 024°T, 2.4 nm from Heron Point Light. You steer 046°T at 5.4 kn through the water. At 0855 a new fix puts you 278°T, 2.8 nm from Tern Island tower.

   Plot the 0855 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  

6. At 1110 your fix is 210°T, 2.1 nm from Gannet Rock daybeacon. You steer 290°T at 5.4 kn through the water. At 1235 a new fix puts you 089°T, 3.5 nm from Westfield church spire.

   Plot the 1235 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1555 your fix is 097°T, 1.2 nm from Westfield church spire. You steer 091°T at 5.7 kn through the water. At 1630 a new fix puts you 048°T, 3.5 nm from Heron Point Light.

   Plot the 1630 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 1225 your fix is 292°T, 2.8 nm from Tern Island tower. You steer 266°T at 6.0 kn through the water. At 1300 a new fix puts you 043°T, 1.4 nm from Westfield church spire.

   Plot the 1300 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