Worksheet 843 · Skill 5

Set and drift

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1. At 0745 your fix is 316°T, 2.8 nm from Tern Island tower. You steer 239°T at 4.0 kn through the water. At 0820 a new fix puts you 050°T, 3.4 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1510 your fix is 008°T, 2.3 nm from Heron Point Light. You steer 359°T at 5.7 kn through the water. At 1600 a new fix puts you 027°T, 3.6 nm from Westfield church spire.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1355 your fix is 008°T, 2.1 nm from Gannet Rock daybeacon. You steer 232°T at 5.9 kn through the water. At 1450 a new fix puts you 341°T, 2.5 nm from Mill stack.

   Plot the 1450 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  

4. At 1535 your fix is 036°T, 3.5 nm from Westfield church spire. You steer 161°T at 7.8 kn through the water. At 1620 a new fix puts you 345°T, 1.8 nm from Mill stack.

   Plot the 1620 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  

5. At 1540 your fix is 355°T, 1.7 nm from Mill stack. You steer 292°T at 7.0 kn through the water. At 1625 a new fix puts you 116°T, 2.2 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1535 your fix is 262°T, 2.1 nm from Gannet Rock daybeacon. You steer 235°T at 6.2 kn through the water. At 1610 a new fix puts you 338°T, 2.0 nm from Mill stack.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1105 your fix is 062°T, 1.8 nm from Heron Point Light. You steer 339°T at 9.0 kn through the water. At 1135 a new fix puts you 028°T, 2.8 nm from Westfield church spire.

   Plot the 1135 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 0705 your fix is 031°T, 3.1 nm from Westfield church spire. You steer 145°T at 8.8 kn through the water. At 0735 a new fix puts you 250°T, 2.8 nm from Tern Island tower.

   Plot the 0735 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