Worksheet 899 · Skill 5

Set and drift

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1. At 0830 your fix is 349°T, 2.0 nm from Heron Point Light. You steer 104°T at 4.3 kn through the water. At 0940 a new fix puts you 004°T, 2.6 nm from Mill stack.

   Plot the 0940 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 0915 your fix is 182°T, 1.9 nm from Gannet Rock daybeacon. You steer 022°T at 5.1 kn through the water. At 1010 a new fix puts you 064°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1010 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 1255 your fix is 077°T, 1.2 nm from Heron Point Light. You steer 059°T at 5.9 kn through the water. At 1340 a new fix puts you 214°T, 2.7 nm from Tern Island tower.

   Plot the 1340 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 1530 your fix is 064°T, 4.9 nm from Tern Island tower. You steer 264°T at 6.0 kn through the water. At 1645 a new fix puts you 035°T, 2.8 nm from Westfield church spire.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0945 your fix is 076°T, 1.8 nm from Heron Point Light. You steer 064°T at 7.9 kn through the water. At 1025 a new fix puts you 251°T, 1.4 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1500 your fix is 002°T, 3.1 nm from Mill stack. You steer 294°T at 4.5 kn through the water. At 1545 a new fix puts you 042°T, 3.5 nm from Heron Point Light.

   Plot the 1545 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 1235 your fix is 035°T, 2.5 nm from Heron Point Light. You steer 140°T at 5.8 kn through the water. At 1310 a new fix puts you 323°T, 1.8 nm from Mill stack.

   Plot the 1310 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 1230 your fix is 288°T, 1.9 nm from Tern Island tower. You steer 296°T at 6.1 kn through the water. At 1305 a new fix puts you 030°T, 3.4 nm from Westfield church spire.

   Plot the 1305 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