Worksheet 828 · Skill 5

Set and drift

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1. At 1050 your fix is 030°T, 2.3 nm from Tern Island tower. You steer 248°T at 6.1 kn through the water. At 1140 a new fix puts you 307°T, 2.8 nm from Tern Island tower.

   Plot the 1140 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  

2. At 0735 your fix is 095°T, 1.4 nm from Gannet Rock daybeacon. You steer 344°T at 4.5 kn through the water. At 0820 a new fix puts you 070°T, 3.9 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1055 your fix is 105°T, 2.7 nm from Westfield church spire. You steer 032°T at 7.3 kn through the water. At 1125 a new fix puts you 283°T, 3.0 nm from Tern Island tower.

   Plot the 1125 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  

4. At 1430 your fix is 191°T, 2.1 nm from Tern Island tower. You steer 307°T at 4.1 kn through the water. At 1545 a new fix puts you 271°T, 2.9 nm from Tern Island tower.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1545 your fix is 072°T, 1.5 nm from Westfield church spire. You steer 106°T at 6.6 kn through the water. At 1650 a new fix puts you 210°T, 1.6 nm from Tern Island tower.

   Plot the 1650 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 0725 your fix is 054°T, 2.0 nm from Gannet Rock daybeacon. You steer 320°T at 4.3 kn through the water. At 0755 a new fix puts you 068°T, 2.2 nm from Tern Island tower.

   Plot the 0755 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  

7. At 0715 your fix is 042°T, 2.1 nm from Kittle water tank. You steer 284°T at 8.1 kn through the water. At 0800 a new fix puts you 263°T, 2.9 nm from Gannet Rock daybeacon.

   Plot the 0800 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  

8. At 1455 your fix is 037°T, 3.9 nm from Westfield church spire. You steer 185°T at 8.4 kn through the water. At 1525 a new fix puts you 102°T, 1.9 nm from Westfield church spire.

   Plot the 1525 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