Worksheet 239 · Skill 5

Set and drift

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1. At 0845 your fix is 217°T, 0.8 nm from Gannet Rock daybeacon. You steer 284°T at 6.1 kn through the water. At 0920 a new fix puts you 221°T, 3.4 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1350 your fix is 086°T, 2.7 nm from Gannet Rock daybeacon. You steer 282°T at 7.6 kn through the water. At 1430 a new fix puts you 319°T, 1.4 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0755 your fix is 094°T, 1.4 nm from Heron Point Light. You steer 330°T at 6.7 kn through the water. At 0850 a new fix puts you 030°T, 3.5 nm from Westfield church spire.

   Plot the 0850 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 0915 your fix is 143°T, 3.5 nm from Westfield church spire. You steer 099°T at 4.9 kn through the water. At 1005 a new fix puts you 259°T, 1.8 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0750 your fix is 259°T, 2.1 nm from Gannet Rock daybeacon. You steer 307°T at 4.2 kn through the water. At 0825 a new fix puts you 257°T, 1.9 nm from Tern Island tower.

   Plot the 0825 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 0720 your fix is 329°T, 1.8 nm from Tern Island tower. You steer 229°T at 4.4 kn through the water. At 0800 a new fix puts you 240°T, 2.4 nm from Tern Island tower.

   Plot the 0800 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  

7. At 1155 your fix is 056°T, 1.9 nm from Heron Point Light. You steer 307°T at 5.1 kn through the water. At 1230 a new fix puts you 094°T, 1.6 nm from Westfield church spire.

   Plot the 1230 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 1400 your fix is 077°T, 2.8 nm from Westfield church spire. You steer 204°T at 5.0 kn through the water. At 1440 a new fix puts you 160°T, 1.5 nm from Westfield church spire.

   Plot the 1440 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