Worksheet 279 · Skill 5

Set and drift

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1. At 0825 your fix is 069°T, 4.9 nm from Tern Island tower. You steer 191°T at 5.1 kn through the water. At 0910 a new fix puts you 022°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 0910 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 306°T, 2.1 nm from Tern Island tower. You steer 090°T at 8.7 kn through the water. At 1250 a new fix puts you 063°T, 2.6 nm from Tern Island tower.

   Plot the 1250 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 1425 your fix is 070°T, 2.0 nm from Westfield church spire. You steer 070°T at 6.8 kn through the water. At 1500 a new fix puts you 304°T, 2.7 nm from Tern Island tower.

   Plot the 1500 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 1330 your fix is 047°T, 1.2 nm from Gannet Rock daybeacon. You steer 196°T at 4.9 kn through the water. At 1410 a new fix puts you 152°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 1410 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 1545 your fix is 077°T, 2.3 nm from Tern Island tower. You steer 142°T at 4.6 kn through the water. At 1630 a new fix puts you 061°T, 3.1 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0940 your fix is 276°T, 1.7 nm from Tern Island tower. You steer 038°T at 4.7 kn through the water. At 1010 a new fix puts you 343°T, 2.5 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1405 your fix is 033°T, 3.5 nm from Gannet Rock daybeacon. You steer 228°T at 6.6 kn through the water. At 1505 a new fix puts you 200°T, 2.3 nm from Tern Island tower.

   Plot the 1505 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  

8. At 0750 your fix is 031°T, 3.3 nm from Heron Point Light. You steer 102°T at 5.6 kn through the water. At 0820 a new fix puts you 219°T, 3.1 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn