Worksheet 792 · Skill 5

Set and drift

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1. At 1220 your fix is 323°T, 2.9 nm from Kittle water tank. You steer 125°T at 4.5 kn through the water. At 1255 a new fix puts you 050°T, 2.1 nm from Kittle water tank.

   Plot the 1255 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  

2. At 0945 your fix is 054°T, 1.6 nm from Kittle water tank. You steer 282°T at 7.1 kn through the water. At 1025 a new fix puts you 249°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 1025 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  

3. At 1210 your fix is 064°T, 3.3 nm from Tern Island tower. You steer 269°T at 8.0 kn through the water. At 1255 a new fix puts you 324°T, 3.0 nm from Tern Island tower.

   Plot the 1255 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  

4. At 0720 your fix is 268°T, 1.6 nm from Tern Island tower. You steer 231°T at 5.4 kn through the water. At 0805 a new fix puts you 034°T, 1.9 nm from Heron Point Light.

   Plot the 0805 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  

5. At 1330 your fix is 269°T, 2.7 nm from Gannet Rock daybeacon. You steer 121°T at 5.1 kn through the water. At 1405 a new fix puts you 213°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 1405 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 015°T, 2.8 nm from Mill stack. You steer 298°T at 4.0 kn through the water. At 1340 a new fix puts you 097°T, 1.5 nm from Westfield church spire.

   Plot the 1340 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  

7. At 1205 your fix is 045°T, 2.9 nm from Westfield church spire. You steer 114°T at 4.3 kn through the water. At 1245 a new fix puts you 273°T, 3.0 nm from Tern Island tower.

   Plot the 1245 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 1050 your fix is 080°T, 2.8 nm from Tern Island tower. You steer 214°T at 5.6 kn through the water. At 1135 a new fix puts you 230°T, 2.2 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn