Worksheet 905 · Skill 5

Set and drift

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1. At 1150 your fix is 254°T, 1.1 nm from Gannet Rock daybeacon. You steer 297°T at 5.9 kn through the water. At 1315 a new fix puts you 050°T, 2.2 nm from Westfield church spire.

   Plot the 1315 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0810 your fix is 020°T, 2.2 nm from Westfield church spire. You steer 119°T at 4.2 kn through the water. At 0915 a new fix puts you 061°T, 3.6 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1410 your fix is 338°T, 2.4 nm from Tern Island tower. You steer 245°T at 4.2 kn through the water. At 1455 a new fix puts you 035°T, 3.3 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1555 your fix is 118°T, 1.9 nm from Westfield church spire. You steer 096°T at 4.7 kn through the water. At 1625 a new fix puts you 251°T, 3.3 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1525 your fix is 050°T, 2.2 nm from Heron Point Light. You steer 070°T at 5.9 kn through the water. At 1645 a new fix puts you 015°T, 1.5 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0725 your fix is 014°T, 3.1 nm from Westfield church spire. You steer 151°T at 6.1 kn through the water. At 0840 a new fix puts you 012°T, 2.1 nm from Mill stack.

   Plot the 0840 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  

7. At 1545 your fix is 103°T, 2.5 nm from Westfield church spire. You steer 332°T at 4.2 kn through the water. At 1625 a new fix puts you 042°T, 2.6 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1405 your fix is 037°T, 4.6 nm from Gannet Rock daybeacon. You steer 272°T at 5.3 kn through the water. At 1530 a new fix puts you 041°T, 4.2 nm from Westfield church spire.

   Plot the 1530 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn