Worksheet 629 · Skill 5

Set and drift

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1. At 0740 your fix is 321°T, 3.2 nm from Tern Island tower. You steer 179°T at 7.5 kn through the water. At 0815 a new fix puts you 238°T, 2.6 nm from Tern Island tower.

   Plot the 0815 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 0950 your fix is 246°T, 3.1 nm from Tern Island tower. You steer 348°T at 5.8 kn through the water. At 1020 a new fix puts you 299°T, 2.8 nm from Tern Island tower.

   Plot the 1020 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 1450 your fix is 083°T, 2.4 nm from Westfield church spire. You steer 357°T at 6.8 kn through the water. At 1520 a new fix puts you 032°T, 4.0 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1240 your fix is 289°T, 2.9 nm from Tern Island tower. You steer 144°T at 5.6 kn through the water. At 1325 a new fix puts you 189°T, 1.8 nm from Tern Island tower.

   Plot the 1325 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  

5. At 1545 your fix is 295°T, 3.3 nm from Tern Island tower. You steer 224°T at 4.2 kn through the water. At 1635 a new fix puts you 085°T, 1.0 nm from Westfield church spire.

   Plot the 1635 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 1250 your fix is 002°T, 3.5 nm from Westfield church spire. You steer 127°T at 4.9 kn through the water. At 1420 a new fix puts you 157°T, 3.0 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1315 your fix is 034°T, 4.1 nm from Westfield church spire. You steer 152°T at 4.0 kn through the water. At 1435 a new fix puts you 209°T, 3.1 nm from Tern Island tower.

   Plot the 1435 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 1240 your fix is 209°T, 1.4 nm from Gannet Rock daybeacon. You steer 269°T at 8.9 kn through the water. At 1310 a new fix puts you 065°T, 1.0 nm from Heron Point Light.

   Plot the 1310 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