Worksheet 913 · Skill 5

Set and drift

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1. At 1330 your fix is 056°T, 2.5 nm from Heron Point Light. You steer 089°T at 6.8 kn through the water. At 1415 a new fix puts you 186°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 1415 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 1305 your fix is 000°T, 2.9 nm from Mill stack. You steer 099°T at 4.6 kn through the water. At 1410 a new fix puts you 036°T, 2.8 nm from Kittle water tank.

   Plot the 1410 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  

3. At 1135 your fix is 203°T, 1.7 nm from Tern Island tower. You steer 282°T at 5.5 kn through the water. At 1215 a new fix puts you 071°T, 3.4 nm from Westfield church spire.

   Plot the 1215 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 0755 your fix is 319°T, 2.1 nm from Mill stack. You steer 357°T at 4.6 kn through the water. At 0830 a new fix puts you 031°T, 3.7 nm from Heron Point Light.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0955 your fix is 290°T, 3.3 nm from Tern Island tower. You steer 172°T at 5.5 kn through the water. At 1030 a new fix puts you 225°T, 2.0 nm from Tern Island tower.

   Plot the 1030 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 1110 your fix is 277°T, 3.2 nm from Tern Island tower. You steer 231°T at 4.3 kn through the water. At 1205 a new fix puts you 103°T, 1.4 nm from Westfield church spire.

   Plot the 1205 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  

7. At 1510 your fix is 051°T, 2.0 nm from Heron Point Light. You steer 068°T at 4.8 kn through the water. At 1550 a new fix puts you 185°T, 1.1 nm from Tern Island tower.

   Plot the 1550 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  

8. At 0820 your fix is 322°T, 2.3 nm from Tern Island tower. You steer 095°T at 4.1 kn through the water. At 0900 a new fix puts you 058°T, 3.3 nm from Tern Island tower.

   Plot the 0900 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