Worksheet 624 · Skill 5

Set and drift

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1. At 1210 your fix is 057°T, 3.1 nm from Heron Point Light. You steer 106°T at 6.5 kn through the water. At 1240 a new fix puts you 247°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 1240 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 1325 your fix is 309°T, 1.8 nm from Tern Island tower. You steer 243°T at 4.3 kn through the water. At 1410 a new fix puts you 082°T, 2.3 nm from Westfield church spire.

   Plot the 1410 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  

3. At 0840 your fix is 221°T, 1.9 nm from Gannet Rock daybeacon. You steer 314°T at 4.2 kn through the water. At 1000 a new fix puts you 045°T, 1.9 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1045 your fix is 006°T, 3.1 nm from Mill stack. You steer 095°T at 4.9 kn through the water. At 1115 a new fix puts you 241°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 1115 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 0730 your fix is 214°T, 2.6 nm from Tern Island tower. You steer 284°T at 5.1 kn through the water. At 0800 a new fix puts you 103°T, 2.7 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1530 your fix is 034°T, 1.4 nm from Heron Point Light. You steer 067°T at 5.5 kn through the water. At 1645 a new fix puts you 359°T, 1.9 nm from Tern Island tower.

   Plot the 1645 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  

7. At 1520 your fix is 021°T, 1.4 nm from Kittle water tank. You steer 352°T at 4.1 kn through the water. At 1605 a new fix puts you 044°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 1605 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 1225 your fix is 057°T, 1.8 nm from Kittle water tank. You steer 280°T at 8.4 kn through the water. At 1330 a new fix puts you 076°T, 3.1 nm from Westfield church spire.

   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