Worksheet 464 · Skill 5

Set and drift

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1. At 0900 your fix is 258°T, 1.7 nm from Tern Island tower. You steer 206°T at 6.3 kn through the water. At 0945 a new fix puts you 036°T, 1.1 nm from Heron Point Light.

   Plot the 0945 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 0905 your fix is 022°T, 2.5 nm from Heron Point Light. You steer 038°T at 6.0 kn through the water. At 0945 a new fix puts you 313°T, 1.8 nm from Tern Island tower.

   Plot the 0945 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  

3. At 0925 your fix is 140°T, 1.9 nm from Westfield church spire. You steer 105°T at 8.1 kn through the water. At 1015 a new fix puts you 196°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1015 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  

4. At 1515 your fix is 245°T, 3.5 nm from Tern Island tower. You steer 156°T at 4.2 kn through the water. At 1615 a new fix puts you 017°T, 1.5 nm from Mill stack.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1350 your fix is 050°T, 1.4 nm from Kittle water tank. You steer 273°T at 7.9 kn through the water. At 1455 a new fix puts you 352°T, 1.7 nm from Mill stack.

   Plot the 1455 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  

6. At 0830 your fix is 264°T, 2.8 nm from Gannet Rock daybeacon. You steer 125°T at 4.2 kn through the water. At 0920 a new fix puts you 168°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 0920 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  

7. At 1545 your fix is 350°T, 2.1 nm from Mill stack. You steer 334°T at 7.9 kn through the water. At 1620 a new fix puts you 047°T, 2.8 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1540 your fix is 035°T, 2.3 nm from Heron Point Light. You steer 110°T at 4.3 kn through the water. At 1645 a new fix puts you 195°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1645 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