Worksheet 672 · Skill 5

Set and drift

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1. At 0835 your fix is 301°T, 3.6 nm from Tern Island tower. You steer 187°T at 6.9 kn through the water. At 0905 a new fix puts you 019°T, 2.9 nm from Heron Point Light.

   Plot the 0905 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  

2. At 0855 your fix is 233°T, 3.2 nm from Tern Island tower. You steer 312°T at 8.5 kn through the water. At 0930 a new fix puts you 013°T, 3.3 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0725 your fix is 029°T, 2.9 nm from Heron Point Light. You steer 036°T at 6.7 kn through the water. At 0755 a new fix puts you 308°T, 1.8 nm from Tern Island tower.

   Plot the 0755 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 1215 your fix is 071°T, 3.9 nm from Tern Island tower. You steer 269°T at 6.6 kn through the water. At 1255 a new fix puts you 339°T, 1.1 nm from Tern Island tower.

   Plot the 1255 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 1055 your fix is 157°T, 1.6 nm from Tern Island tower. You steer 075°T at 4.3 kn through the water. At 1125 a new fix puts you 099°T, 2.1 nm from Tern Island tower.

   Plot the 1125 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 1455 your fix is 009°T, 2.1 nm from Gannet Rock daybeacon. You steer 214°T at 7.4 kn through the water. At 1535 a new fix puts you 022°T, 2.0 nm from Mill stack.

   Plot the 1535 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  

7. At 1300 your fix is 287°T, 4.0 nm from Tern Island tower. You steer 201°T at 4.1 kn through the water. At 1420 a new fix puts you 009°T, 2.4 nm from Heron Point Light.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1545 your fix is 141°T, 1.4 nm from Tern Island tower. You steer 238°T at 4.0 kn through the water. At 1625 a new fix puts you 271°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1625 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