Worksheet 379 · Skill 5

Set and drift

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1. At 0755 your fix is 067°T, 3.5 nm from Westfield church spire. You steer 186°T at 4.0 kn through the water. At 0855 a new fix puts you 303°T, 3.6 nm from Mill stack.

   Plot the 0855 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  

2. At 1340 your fix is 064°T, 4.5 nm from Tern Island tower. You steer 223°T at 6.1 kn through the water. At 1505 a new fix puts you 008°T, 2.6 nm from Mill stack.

   Plot the 1505 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 1345 your fix is 045°T, 3.6 nm from Westfield church spire. You steer 127°T at 5.1 kn through the water. At 1500 a new fix puts you 249°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1500 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  

4. At 1230 your fix is 358°T, 1.8 nm from Tern Island tower. You steer 104°T at 8.0 kn through the water. At 1305 a new fix puts you 070°T, 4.8 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  

5. At 1600 your fix is 283°T, 1.9 nm from Gannet Rock daybeacon. You steer 256°T at 5.3 kn through the water. At 1645 a new fix puts you 037°T, 3.4 nm from Heron Point Light.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1010 your fix is 063°T, 2.7 nm from Heron Point Light. You steer 272°T at 5.1 kn through the water. At 1040 a new fix puts you 004°T, 2.1 nm from Heron Point Light.

   Plot the 1040 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 1250 your fix is 342°T, 2.8 nm from Kittle water tank. You steer 035°T at 5.5 kn through the water. At 1335 a new fix puts you 071°T, 5.3 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1140 your fix is 282°T, 1.5 nm from Gannet Rock daybeacon. You steer 048°T at 7.6 kn through the water. At 1225 a new fix puts you 029°T, 3.3 nm from Gannet Rock daybeacon.

   Plot the 1225 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