Worksheet 690 · Skill 5

Set and drift

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1. At 1335 your fix is 131°T, 1.5 nm from Westfield church spire. You steer 033°T at 4.1 kn through the water. At 1420 a new fix puts you 260°T, 3.7 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1425 your fix is 159°T, 1.2 nm from Westfield church spire. You steer 088°T at 5.2 kn through the water. At 1530 a new fix puts you 254°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 1530 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  

3. At 0710 your fix is 079°T, 2.1 nm from Westfield church spire. You steer 130°T at 6.4 kn through the water. At 0745 a new fix puts you 225°T, 3.3 nm from Tern Island tower.

   Plot the 0745 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 1100 your fix is 355°T, 1.5 nm from Tern Island tower. You steer 233°T at 8.7 kn through the water. At 1130 a new fix puts you 020°T, 2.9 nm from Heron Point Light.

   Plot the 1130 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  

5. At 0905 your fix is 041°T, 2.7 nm from Tern Island tower. You steer 145°T at 6.2 kn through the water. At 0955 a new fix puts you 099°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 0955 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 0700 your fix is 222°T, 1.8 nm from Tern Island tower. You steer 167°T at 7.7 kn through the water. At 0730 a new fix puts you 227°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 0730 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 349°T, 1.8 nm from Mill stack. You steer 045°T at 7.0 kn through the water. At 1435 a new fix puts you 288°T, 1.2 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1505 your fix is 228°T, 2.3 nm from Tern Island tower. You steer 081°T at 4.9 kn through the water. At 1610 a new fix puts you 066°T, 3.2 nm from Gannet Rock daybeacon.

   Plot the 1610 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