Worksheet 585 · Skill 5

Set and drift

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1. At 1215 your fix is 146°T, 2.4 nm from Tern Island tower. You steer 017°T at 6.1 kn through the water. At 1250 a new fix puts you 075°T, 3.4 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  

2. At 1055 your fix is 328°T, 1.3 nm from Kittle water tank. You steer 314°T at 6.8 kn through the water. At 1215 a new fix puts you 264°T, 2.2 nm from Tern Island tower.

   Plot the 1215 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  

3. At 0855 your fix is 219°T, 2.9 nm from Tern Island tower. You steer 319°T at 5.8 kn through the water. At 0935 a new fix puts you 060°T, 3.0 nm from Westfield church spire.

   Plot the 0935 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  

4. At 0950 your fix is 004°T, 2.1 nm from Mill stack. You steer 319°T at 4.4 kn through the water. At 1120 a new fix puts you 014°T, 2.6 nm from Westfield church spire.

   Plot the 1120 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1415 your fix is 005°T, 2.4 nm from Tern Island tower. You steer 224°T at 6.2 kn through the water. At 1510 a new fix puts you 108°T, 2.3 nm from Westfield church spire.

   Plot the 1510 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  

6. At 1025 your fix is 106°T, 2.6 nm from Westfield church spire. You steer 032°T at 5.1 kn through the water. At 1120 a new fix puts you 303°T, 3.9 nm from Tern Island tower.

   Plot the 1120 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  

7. At 1245 your fix is 326°T, 2.2 nm from Mill stack. You steer 006°T at 4.8 kn through the water. At 1325 a new fix puts you 273°T, 3.5 nm from Tern Island tower.

   Plot the 1325 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 1220 your fix is 062°T, 2.9 nm from Gannet Rock daybeacon. You steer 213°T at 6.3 kn through the water. At 1255 a new fix puts you 146°T, 1.6 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn