Worksheet 618 · Skill 5

Set and drift

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1. At 0945 your fix is 022°T, 2.3 nm from Kittle water tank. You steer 280°T at 7.1 kn through the water. At 1020 a new fix puts you 252°T, 1.5 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1600 your fix is 031°T, 3.9 nm from Gannet Rock daybeacon. You steer 185°T at 6.3 kn through the water. At 1650 a new fix puts you 356°T, 1.5 nm from Kittle water tank.

   Plot the 1650 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 0705 your fix is 246°T, 3.2 nm from Tern Island tower. You steer 328°T at 4.8 kn through the water. At 0750 a new fix puts you 027°T, 3.7 nm from Westfield church spire.

   Plot the 0750 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  

4. At 1200 your fix is 077°T, 2.0 nm from Westfield church spire. You steer 106°T at 4.8 kn through the water. At 1305 a new fix puts you 240°T, 1.3 nm from Tern Island tower.

   Plot the 1305 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  

5. At 1530 your fix is 035°T, 2.5 nm from Westfield church spire. You steer 109°T at 5.8 kn through the water. At 1615 a new fix puts you 216°T, 1.8 nm from Tern Island tower.

   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  

6. At 0810 your fix is 201°T, 2.5 nm from Tern Island tower. You steer 276°T at 6.6 kn through the water. At 0845 a new fix puts you 102°T, 2.1 nm from Westfield church spire.

   Plot the 0845 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  

7. At 1305 your fix is 327°T, 1.6 nm from Tern Island tower. You steer 261°T at 8.3 kn through the water. At 1345 a new fix puts you 040°T, 1.0 nm from Westfield church spire.

   Plot the 1345 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  

8. At 0835 your fix is 228°T, 2.2 nm from Tern Island tower. You steer 276°T at 4.4 kn through the water. At 0905 a new fix puts you 082°T, 3.2 nm from Westfield church spire.

   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