Worksheet 574 · Skill 5

Set and drift

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1. At 0920 your fix is 207°T, 3.1 nm from Tern Island tower. You steer 343°T at 8.6 kn through the water. At 0950 a new fix puts you 307°T, 3.3 nm from Tern Island tower.

   Plot the 0950 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  

2. At 1450 your fix is 095°T, 1.6 nm from Heron Point Light. You steer 016°T at 8.5 kn through the water. At 1520 a new fix puts you 248°T, 2.9 nm from Tern Island tower.

   Plot the 1520 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  

3. At 1050 your fix is 050°T, 1.8 nm from Westfield church spire. You steer 147°T at 6.6 kn through the water. At 1135 a new fix puts you 069°T, 2.0 nm from Heron Point Light.

   Plot the 1135 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 1155 your fix is 210°T, 2.0 nm from Gannet Rock daybeacon. You steer 282°T at 6.1 kn through the water. At 1255 a new fix puts you 023°T, 2.9 nm from Heron Point Light.

   Plot the 1255 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1025 your fix is 060°T, 4.6 nm from Tern Island tower. You steer 180°T at 4.7 kn through the water. At 1150 a new fix puts you 040°T, 2.1 nm from Kittle water tank.

   Plot the 1150 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  

6. At 1555 your fix is 032°T, 2.9 nm from Westfield church spire. You steer 090°T at 4.6 kn through the water. At 1715 a new fix puts you 301°T, 3.1 nm from Tern Island tower.

   Plot the 1715 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  

7. At 0825 your fix is 040°T, 4.0 nm from Westfield church spire. You steer 185°T at 4.6 kn through the water. At 0905 a new fix puts you 066°T, 1.9 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1305 your fix is 067°T, 4.8 nm from Tern Island tower. You steer 199°T at 4.2 kn through the water. At 1350 a new fix puts you 061°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 1350 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