Worksheet 492 · Skill 5

Set and drift

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1. At 1130 your fix is 091°T, 1.8 nm from Westfield church spire. You steer 122°T at 7.7 kn through the water. At 1210 a new fix puts you 023°T, 2.7 nm from Mill stack.

   Plot the 1210 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  

2. At 1500 your fix is 032°T, 3.6 nm from Heron Point Light. You steer 340°T at 5.7 kn through the water. At 1545 a new fix puts you 056°T, 4.1 nm from Westfield church spire.

   Plot the 1545 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  

3. At 1130 your fix is 059°T, 1.4 nm from Westfield church spire. You steer 102°T at 4.9 kn through the water. At 1300 a new fix puts you 146°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1300 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1230 your fix is 067°T, 1.2 nm from Heron Point Light. You steer 352°T at 4.7 kn through the water. At 1345 a new fix puts you 047°T, 4.2 nm from Westfield church spire.

   Plot the 1345 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  

5. At 1315 your fix is 090°T, 1.8 nm from Tern Island tower. You steer 127°T at 4.4 kn through the water. At 1355 a new fix puts you 058°T, 2.9 nm from Gannet Rock daybeacon.

   Plot the 1355 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 1330 your fix is 083°T, 2.8 nm from Gannet Rock daybeacon. You steer 246°T at 4.6 kn through the water. At 1405 a new fix puts you 203°T, 1.2 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  

7. At 0820 your fix is 057°T, 1.9 nm from Gannet Rock daybeacon. You steer 271°T at 5.9 kn through the water. At 0915 a new fix puts you 191°T, 1.9 nm from Tern Island tower.

   Plot the 0915 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  

8. At 0830 your fix is 190°T, 2.0 nm from Tern Island tower. You steer 261°T at 4.8 kn through the water. At 0930 a new fix puts you 001°T, 1.3 nm from Heron Point Light.

   Plot the 0930 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