Worksheet 796 · Skill 5

Set and drift

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1. At 1305 your fix is 207°T, 1.7 nm from Gannet Rock daybeacon. You steer 281°T at 4.3 kn through the water. At 1335 a new fix puts you 020°T, 1.9 nm from Mill stack.

   Plot the 1335 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 1100 your fix is 240°T, 3.4 nm from Tern Island tower. You steer 291°T at 6.7 kn through the water. At 1135 a new fix puts you 037°T, 1.6 nm from Westfield church spire.

   Plot the 1135 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 1350 your fix is 067°T, 4.9 nm from Tern Island tower. You steer 266°T at 8.4 kn through the water. At 1450 a new fix puts you 296°T, 3.9 nm from Tern Island tower.

   Plot the 1450 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  

4. At 0905 your fix is 244°T, 2.5 nm from Gannet Rock daybeacon. You steer 035°T at 8.9 kn through the water. At 0955 a new fix puts you 037°T, 4.3 nm from Gannet Rock daybeacon.

   Plot the 0955 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  

5. At 1335 your fix is 022°T, 2.3 nm from Heron Point Light. You steer 092°T at 4.2 kn through the water. At 1420 a new fix puts you 001°T, 3.1 nm from Mill stack.

   Plot the 1420 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  

6. At 0855 your fix is 091°T, 2.5 nm from Tern Island tower. You steer 061°T at 4.9 kn through the water. At 0930 a new fix puts you 039°T, 4.3 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0705 your fix is 061°T, 1.6 nm from Gannet Rock daybeacon. You steer 263°T at 5.3 kn through the water. At 0740 a new fix puts you 283°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 0740 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  

8. At 1240 your fix is 064°T, 3.9 nm from Tern Island tower. You steer 186°T at 7.5 kn through the water. At 1320 a new fix puts you 109°T, 1.4 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn