Worksheet 721 · Skill 5

Set and drift

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1. At 1255 your fix is 319°T, 1.3 nm from Tern Island tower. You steer 056°T at 4.2 kn through the water. At 1325 a new fix puts you 005°T, 1.5 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0855 your fix is 061°T, 3.3 nm from Gannet Rock daybeacon. You steer 194°T at 4.3 kn through the water. At 0925 a new fix puts you 094°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 0925 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 1320 your fix is 325°T, 2.8 nm from Tern Island tower. You steer 203°T at 6.1 kn through the water. At 1430 a new fix puts you 327°T, 2.2 nm from Mill stack.

   Plot the 1430 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1300 your fix is 210°T, 3.2 nm from Tern Island tower. You steer 075°T at 7.9 kn through the water. At 1330 a new fix puts you 022°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 1330 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 1225 your fix is 087°T, 3.5 nm from Westfield church spire. You steer 059°T at 4.1 kn through the water. At 1330 a new fix puts you 293°T, 1.7 nm from Tern Island tower.

   Plot the 1330 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 1210 your fix is 295°T, 4.0 nm from Tern Island tower. You steer 172°T at 6.7 kn through the water. At 1245 a new fix puts you 023°T, 3.1 nm from Heron Point Light.

   Plot the 1245 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 0945 your fix is 055°T, 2.4 nm from Heron Point Light. You steer 096°T at 5.7 kn through the water. At 1020 a new fix puts you 036°T, 1.9 nm from Mill stack.

   Plot the 1020 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  

8. At 0900 your fix is 324°T, 2.9 nm from Tern Island tower. You steer 237°T at 8.8 kn through the water. At 0930 a new fix puts you 053°T, 2.3 nm from Westfield church spire.

   Plot the 0930 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