Worksheet 337 · Skill 5

Set and drift

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1. At 1510 your fix is 066°T, 1.5 nm from Gannet Rock daybeacon. You steer 028°T at 4.5 kn through the water. At 1555 a new fix puts you 068°T, 4.7 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0845 your fix is 018°T, 2.8 nm from Heron Point Light. You steer 091°T at 5.3 kn through the water. At 0940 a new fix puts you 192°T, 1.4 nm from Tern Island tower.

   Plot the 0940 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1525 your fix is 264°T, 1.2 nm from Gannet Rock daybeacon. You steer 117°T at 7.2 kn through the water. At 1555 a new fix puts you 019°T, 1.9 nm from Kittle water tank.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1550 your fix is 197°T, 0.9 nm from Gannet Rock daybeacon. You steer 276°T at 4.6 kn through the water. At 1655 a new fix puts you 305°T, 3.6 nm from Mill stack.

   Plot the 1655 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 041°T, 2.9 nm from Westfield church spire. You steer 066°T at 4.0 kn through the water. At 1600 a new fix puts you 307°T, 4.3 nm from Tern Island tower.

   Plot the 1600 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 0710 your fix is 108°T, 1.8 nm from Westfield church spire. You steer 000°T at 5.4 kn through the water. At 0740 a new fix puts you 025°T, 2.4 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 1230 your fix is 020°T, 2.1 nm from Tern Island tower. You steer 153°T at 7.5 kn through the water. At 1320 a new fix puts you 100°T, 2.8 nm from Gannet Rock daybeacon.

   Plot the 1320 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  

8. At 1315 your fix is 039°T, 1.5 nm from Tern Island tower. You steer 156°T at 4.9 kn through the water. At 1345 a new fix puts you 095°T, 1.9 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn