Worksheet 591 · Skill 5

Set and drift

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1. At 1500 your fix is 018°T, 2.7 nm from Mill stack. You steer 060°T at 4.3 kn through the water. At 1535 a new fix puts you 306°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 1535 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 1435 your fix is 221°T, 1.9 nm from Gannet Rock daybeacon. You steer 309°T at 4.4 kn through the water. At 1540 a new fix puts you 023°T, 2.0 nm from Heron Point Light.

   Plot the 1540 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 1015 your fix is 034°T, 3.3 nm from Westfield church spire. You steer 188°T at 4.7 kn through the water. At 1045 a new fix puts you 091°T, 1.8 nm from Westfield church spire.

   Plot the 1045 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 1205 your fix is 331°T, 1.5 nm from Heron Point Light. You steer 070°T at 5.0 kn through the water. At 1320 a new fix puts you 354°T, 3.2 nm from Mill stack.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0845 your fix is 062°T, 3.2 nm from Heron Point Light. You steer 295°T at 8.3 kn through the water. At 0915 a new fix puts you 090°T, 1.6 nm from Westfield church spire.

   Plot the 0915 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 0815 your fix is 083°T, 2.3 nm from Westfield church spire. You steer 125°T at 8.4 kn through the water. At 0850 a new fix puts you 254°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 0850 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 1535 your fix is 011°T, 1.1 nm from Heron Point Light. You steer 092°T at 8.2 kn through the water. At 1625 a new fix puts you 322°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 1625 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 1525 your fix is 021°T, 1.2 nm from Heron Point Light. You steer 076°T at 4.4 kn through the water. At 1605 a new fix puts you 242°T, 2.8 nm from Tern Island tower.

   Plot the 1605 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