Worksheet 93 · Skill 5

Set and drift

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1. At 1530 your fix is 339°T, 1.7 nm from Tern Island tower. You steer 254°T at 5.9 kn through the water. At 1630 a new fix puts you 039°T, 1.0 nm from Westfield church spire.

   Plot the 1630 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  

2. At 1505 your fix is 139°T, 1.5 nm from Gannet Rock daybeacon. You steer 278°T at 5.3 kn through the water. At 1620 a new fix puts you 250°T, 3.1 nm from Tern Island tower.

   Plot the 1620 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  

3. At 1025 your fix is 003°T, 2.1 nm from Westfield church spire. You steer 121°T at 4.2 kn through the water. At 1130 a new fix puts you 052°T, 2.0 nm from Heron Point Light.

   Plot the 1130 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  

4. At 1300 your fix is 259°T, 3.3 nm from Tern Island tower. You steer 194°T at 4.1 kn through the water. At 1335 a new fix puts you 043°T, 3.0 nm from Heron Point Light.

   Plot the 1335 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  

5. At 0905 your fix is 301°T, 1.5 nm from Gannet Rock daybeacon. You steer 249°T at 5.4 kn through the water. At 0955 a new fix puts you 037°T, 2.6 nm from Heron Point Light.

   Plot the 0955 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  

6. At 1215 your fix is 236°T, 2.7 nm from Tern Island tower. You steer 094°T at 6.3 kn through the water. At 1250 a new fix puts you 132°T, 2.8 nm from Tern Island tower.

   Plot the 1250 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  

7. At 1320 your fix is 309°T, 2.7 nm from Tern Island tower. You steer 180°T at 6.2 kn through the water. At 1410 a new fix puts you 345°T, 2.7 nm from Mill stack.

   Plot the 1410 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  

8. At 0930 your fix is 312°T, 0.9 nm from Gannet Rock daybeacon. You steer 060°T at 5.5 kn through the water. At 1005 a new fix puts you 026°T, 3.1 nm from Gannet Rock daybeacon.

   Plot the 1005 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