Worksheet 350 · Skill 5

Set and drift

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1. At 0710 your fix is 032°T, 3.9 nm from Gannet Rock daybeacon. You steer 227°T at 5.5 kn through the water. At 0835 a new fix puts you 323°T, 1.4 nm from Mill stack.

   Plot the 0835 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0850 your fix is 046°T, 2.7 nm from Heron Point Light. You steer 339°T at 7.7 kn through the water. At 0930 a new fix puts you 044°T, 3.9 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1535 your fix is 355°T, 2.8 nm from Mill stack. You steer 051°T at 7.9 kn through the water. At 1620 a new fix puts you 014°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1620 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 1205 your fix is 061°T, 3.3 nm from Tern Island tower. You steer 188°T at 5.8 kn through the water. At 1235 a new fix puts you 134°T, 2.4 nm from Tern Island tower.

   Plot the 1235 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 1550 your fix is 221°T, 2.6 nm from Tern Island tower. You steer 116°T at 4.8 kn through the water. At 1620 a new fix puts you 272°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 1620 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 1600 your fix is 090°T, 1.7 nm from Heron Point Light. You steer 081°T at 4.4 kn through the water. At 1725 a new fix puts you 177°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1725 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1440 your fix is 034°T, 2.3 nm from Gannet Rock daybeacon. You steer 261°T at 6.9 kn through the water. At 1540 a new fix puts you 067°T, 2.2 nm from Heron Point Light.

   Plot the 1540 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 0945 your fix is 200°T, 1.5 nm from Gannet Rock daybeacon. You steer 306°T at 6.8 kn through the water. At 1115 a new fix puts you 069°T, 3.2 nm from Westfield church spire.

   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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn