Worksheet 319 · Skill 5

Set and drift

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1. At 1100 your fix is 258°T, 3.3 nm from Tern Island tower. You steer 136°T at 5.7 kn through the water. At 1145 a new fix puts you 245°T, 1.8 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1555 your fix is 024°T, 1.5 nm from Gannet Rock daybeacon. You steer 242°T at 8.2 kn through the water. At 1630 a new fix puts you 227°T, 3.4 nm from Tern Island tower.

   Plot the 1630 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 0815 your fix is 317°T, 2.2 nm from Tern Island tower. You steer 215°T at 4.3 kn through the water. At 0935 a new fix puts you 037°T, 0.9 nm from Heron Point Light.

   Plot the 0935 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 1035 your fix is 059°T, 3.9 nm from Westfield church spire. You steer 145°T at 4.9 kn through the water. At 1140 a new fix puts you 050°T, 1.7 nm from Mill stack.

   Plot the 1140 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  

5. At 1120 your fix is 093°T, 2.7 nm from Gannet Rock daybeacon. You steer 298°T at 4.3 kn through the water. At 1200 a new fix puts you 332°T, 2.9 nm from Kittle water tank.

   Plot the 1200 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  

6. At 0950 your fix is 062°T, 1.6 nm from Gannet Rock daybeacon. You steer 016°T at 5.5 kn through the water. At 1020 a new fix puts you 061°T, 3.7 nm from Tern Island tower.

   Plot the 1020 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 0715 your fix is 066°T, 1.4 nm from Westfield church spire. You steer 138°T at 4.0 kn through the water. At 0840 a new fix puts you 059°T, 3.4 nm from Heron Point Light.

   Plot the 0840 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  

8. At 0950 your fix is 085°T, 1.2 nm from Heron Point Light. You steer 006°T at 6.5 kn through the water. At 1020 a new fix puts you 265°T, 3.2 nm from Tern Island tower.

   Plot the 1020 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