Worksheet 486 · Skill 5

Set and drift

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1. At 0915 your fix is 054°T, 2.5 nm from Tern Island tower. You steer 174°T at 4.2 kn through the water. At 1025 a new fix puts you 210°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 1025 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0955 your fix is 034°T, 1.3 nm from Westfield church spire. You steer 146°T at 4.6 kn through the water. At 1050 a new fix puts you 090°T, 1.0 nm from Heron Point Light.

   Plot the 1050 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 0820 your fix is 210°T, 2.3 nm from Gannet Rock daybeacon. You steer 295°T at 4.9 kn through the water. At 0905 a new fix puts you 050°T, 3.3 nm from Heron Point Light.

   Plot the 0905 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  

4. At 0755 your fix is 099°T, 2.8 nm from Gannet Rock daybeacon. You steer 267°T at 5.9 kn through the water. At 0915 a new fix puts you 349°T, 2.9 nm from Mill stack.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1235 your fix is 060°T, 5.0 nm from Tern Island tower. You steer 257°T at 4.0 kn through the water. At 1345 a new fix puts you 303°T, 2.8 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0940 your fix is 332°T, 1.3 nm from Heron Point Light. You steer 101°T at 5.9 kn through the water. At 1025 a new fix puts you 330°T, 1.1 nm from Mill stack.

   Plot the 1025 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  

7. At 1520 your fix is 090°T, 2.3 nm from Tern Island tower. You steer 147°T at 7.4 kn through the water. At 1550 a new fix puts you 117°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1550 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 1325 your fix is 044°T, 2.4 nm from Tern Island tower. You steer 270°T at 6.0 kn through the water. At 1430 a new fix puts you 054°T, 3.7 nm from Westfield church spire.

   Plot the 1430 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