Worksheet 61 · Skill 5

Set and drift

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1. At 1555 your fix is 094°T, 1.5 nm from Heron Point Light. You steer 356°T at 4.2 kn through the water. At 1645 a new fix puts you 076°T, 3.1 nm from Westfield church spire.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1515 your fix is 221°T, 2.1 nm from Gannet Rock daybeacon. You steer 312°T at 5.8 kn through the water. At 1640 a new fix puts you 087°T, 2.9 nm from Westfield church spire.

   Plot the 1640 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  

3. At 1535 your fix is 241°T, 2.2 nm from Tern Island tower. You steer 266°T at 4.8 kn through the water. At 1615 a new fix puts you 090°T, 2.8 nm from Westfield church spire.

   Plot the 1615 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  

4. At 0750 your fix is 085°T, 2.8 nm from Gannet Rock daybeacon. You steer 313°T at 6.2 kn through the water. At 0830 a new fix puts you 053°T, 1.8 nm from Tern Island tower.

   Plot the 0830 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  

5. At 1230 your fix is 057°T, 2.3 nm from Heron Point Light. You steer 355°T at 6.1 kn through the water. At 1305 a new fix puts you 290°T, 3.2 nm from Tern Island tower.

   Plot the 1305 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 1235 your fix is 342°T, 2.5 nm from Mill stack. You steer 066°T at 8.0 kn through the water. At 1320 a new fix puts you 030°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 1320 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  

7. At 1050 your fix is 045°T, 3.9 nm from Westfield church spire. You steer 128°T at 5.8 kn through the water. At 1145 a new fix puts you 291°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1145 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  

8. At 0935 your fix is 220°T, 2.8 nm from Tern Island tower. You steer 109°T at 6.9 kn through the water. At 1010 a new fix puts you 203°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1010 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