Worksheet 354 · Skill 5

Set and drift

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1. At 0925 your fix is 098°T, 1.6 nm from Westfield church spire. You steer 023°T at 6.4 kn through the water. At 1000 a new fix puts you 044°T, 3.0 nm from Westfield church spire.

   Plot the 1000 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 0725 your fix is 049°T, 1.5 nm from Westfield church spire. You steer 035°T at 4.9 kn through the water. At 0800 a new fix puts you 042°T, 4.6 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1305 your fix is 032°T, 2.3 nm from Heron Point Light. You steer 064°T at 4.1 kn through the water. At 1350 a new fix puts you 236°T, 2.3 nm from Tern Island tower.

   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  

4. At 1430 your fix is 312°T, 1.3 nm from Gannet Rock daybeacon. You steer 075°T at 7.8 kn through the water. At 1500 a new fix puts you 048°T, 3.5 nm from Gannet Rock daybeacon.

   Plot the 1500 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 0725 your fix is 047°T, 3.1 nm from Gannet Rock daybeacon. You steer 186°T at 4.4 kn through the water. At 0805 a new fix puts you 074°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 0805 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  

6. At 1315 your fix is 081°T, 2.0 nm from Heron Point Light. You steer 090°T at 6.9 kn through the water. At 1350 a new fix puts you 257°T, 1.3 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1140 your fix is 043°T, 4.4 nm from Westfield church spire. You steer 156°T at 5.7 kn through the water. At 1225 a new fix puts you 258°T, 2.1 nm from Tern Island tower.

   Plot the 1225 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  

8. At 1515 your fix is 357°T, 2.3 nm from Mill stack. You steer 319°T at 8.9 kn through the water. At 1600 a new fix puts you 018°T, 1.7 nm from Westfield church spire.

   Plot the 1600 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