Worksheet 655 · Skill 5

Set and drift

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1. At 1320 your fix is 320°T, 2.1 nm from Mill stack. You steer 013°T at 6.0 kn through the water. At 1355 a new fix puts you 232°T, 2.6 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0935 your fix is 037°T, 4.1 nm from Gannet Rock daybeacon. You steer 191°T at 6.6 kn through the water. At 1025 a new fix puts you 321°T, 1.5 nm from Kittle water tank.

   Plot the 1025 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 1520 your fix is 254°T, 3.0 nm from Tern Island tower. You steer 230°T at 5.5 kn through the water. At 1555 a new fix puts you 349°T, 1.3 nm from Heron Point Light.

   Plot the 1555 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 1240 your fix is 032°T, 1.8 nm from Mill stack. You steer 037°T at 4.9 kn through the water. At 1355 a new fix puts you 083°T, 1.9 nm from Gannet Rock daybeacon.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0730 your fix is 037°T, 1.8 nm from Westfield church spire. You steer 080°T at 7.6 kn through the water. At 0835 a new fix puts you 343°T, 2.5 nm from Tern Island tower.

   Plot the 0835 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  

6. At 0710 your fix is 126°T, 1.7 nm from Westfield church spire. You steer 019°T at 7.0 kn through the water. At 0740 a new fix puts you 037°T, 4.1 nm from Westfield church spire.

   Plot the 0740 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  

7. At 1040 your fix is 301°T, 1.4 nm from Gannet Rock daybeacon. You steer 288°T at 4.2 kn through the water. At 1110 a new fix puts you 206°T, 1.9 nm from Tern Island tower.

   Plot the 1110 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  

8. At 0905 your fix is 059°T, 4.0 nm from Westfield church spire. You steer 078°T at 9.0 kn through the water. At 0935 a new fix puts you 033°T, 2.8 nm from Tern Island tower.

   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