Worksheet 422 · Skill 5

Set and drift

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1. At 1210 your fix is 083°T, 1.3 nm from Westfield church spire. You steer 127°T at 4.5 kn through the water. At 1320 a new fix puts you 251°T, 2.7 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1135 your fix is 048°T, 4.3 nm from Westfield church spire. You steer 168°T at 6.9 kn through the water. At 1205 a new fix puts you 252°T, 3.2 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0750 your fix is 323°T, 3.1 nm from Kittle water tank. You steer 116°T at 7.3 kn through the water. At 0820 a new fix puts you 034°T, 1.0 nm from Kittle water tank.

   Plot the 0820 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  

4. At 1035 your fix is 290°T, 3.8 nm from Tern Island tower. You steer 137°T at 5.1 kn through the water. At 1125 a new fix puts you 205°T, 3.0 nm from Tern Island tower.

   Plot the 1125 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 0810 your fix is 281°T, 2.9 nm from Tern Island tower. You steer 170°T at 4.4 kn through the water. At 0855 a new fix puts you 056°T, 3.0 nm from Heron Point Light.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0745 your fix is 031°T, 3.7 nm from Westfield church spire. You steer 218°T at 5.1 kn through the water. At 0820 a new fix puts you 043°T, 1.3 nm from Westfield church spire.

   Plot the 0820 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 0740 your fix is 191°T, 1.9 nm from Gannet Rock daybeacon. You steer 299°T at 8.6 kn through the water. At 0850 a new fix puts you 003°T, 2.2 nm from Westfield church spire.

   Plot the 0850 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1345 your fix is 069°T, 1.3 nm from Heron Point Light. You steer 121°T at 4.4 kn through the water. At 1415 a new fix puts you 337°T, 2.3 nm from Mill stack.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn