Worksheet 648 · Skill 5

Set and drift

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1. At 0910 your fix is 050°T, 3.1 nm from Gannet Rock daybeacon. You steer 324°T at 5.7 kn through the water. At 0950 a new fix puts you 050°T, 2.4 nm from Tern Island tower.

   Plot the 0950 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  

2. At 1215 your fix is 273°T, 3.1 nm from Tern Island tower. You steer 160°T at 5.2 kn through the water. At 1315 a new fix puts you 333°T, 2.1 nm from Mill stack.

   Plot the 1315 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  

3. At 1045 your fix is 309°T, 2.1 nm from Tern Island tower. You steer 232°T at 5.0 kn through the water. At 1130 a new fix puts you 072°T, 2.7 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1200 your fix is 062°T, 2.4 nm from Westfield church spire. You steer 128°T at 5.4 kn through the water. At 1315 a new fix puts you 018°T, 2.9 nm from Mill stack.

   Plot the 1315 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  

5. At 1305 your fix is 359°T, 3.0 nm from Mill stack. You steer 355°T at 8.0 kn through the water. At 1340 a new fix puts you 317°T, 3.1 nm from Tern Island tower.

   Plot the 1340 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 1255 your fix is 042°T, 1.0 nm from Gannet Rock daybeacon. You steer 091°T at 4.9 kn through the water. At 1325 a new fix puts you 080°T, 2.9 nm from Gannet Rock daybeacon.

   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  

7. At 1600 your fix is 319°T, 2.2 nm from Tern Island tower. You steer 106°T at 5.8 kn through the water. At 1700 a new fix puts you 078°T, 2.8 nm from Tern Island tower.

   Plot the 1700 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  

8. At 1005 your fix is 298°T, 4.1 nm from Tern Island tower. You steer 087°T at 6.6 kn through the water. At 1050 a new fix puts you 052°T, 1.5 nm from Tern Island tower.

   Plot the 1050 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