Worksheet 821 · Skill 5

Set and drift

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1. At 0805 your fix is 261°T, 1.7 nm from Tern Island tower. You steer 252°T at 4.4 kn through the water. At 0920 a new fix puts you 072°T, 1.7 nm from Westfield church spire.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0745 your fix is 052°T, 2.4 nm from Westfield church spire. You steer 094°T at 6.0 kn through the water. At 0820 a new fix puts you 269°T, 1.3 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1045 your fix is 290°T, 1.9 nm from Tern Island tower. You steer 231°T at 5.1 kn through the water. At 1140 a new fix puts you 094°T, 2.5 nm from Westfield church spire.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0930 your fix is 059°T, 3.5 nm from Westfield church spire. You steer 312°T at 4.0 kn through the water. At 1000 a new fix puts you 030°T, 3.2 nm from Westfield church spire.

   Plot the 1000 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 1520 your fix is 087°T, 1.6 nm from Westfield church spire. You steer 122°T at 5.7 kn through the water. At 1555 a new fix puts you 240°T, 3.1 nm from Tern Island tower.

   Plot the 1555 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  

6. At 1500 your fix is 039°T, 4.0 nm from Westfield church spire. You steer 146°T at 4.0 kn through the water. At 1550 a new fix puts you 265°T, 2.6 nm from Tern Island tower.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1305 your fix is 032°T, 2.3 nm from Tern Island tower. You steer 257°T at 7.6 kn through the water. At 1345 a new fix puts you 299°T, 3.4 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1035 your fix is 077°T, 2.0 nm from Tern Island tower. You steer 066°T at 5.3 kn through the water. At 1110 a new fix puts you 070°T, 5.4 nm from Tern Island tower.

   Plot the 1110 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