Worksheet 398 · Skill 5

Set and drift

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1. At 0740 your fix is 035°T, 3.7 nm from Westfield church spire. You steer 183°T at 6.3 kn through the water. At 0810 a new fix puts you 079°T, 1.4 nm from Westfield church spire.

   Plot the 0810 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  

2. At 1240 your fix is 209°T, 2.6 nm from Tern Island tower. You steer 290°T at 4.0 kn through the water. At 1355 a new fix puts you 094°T, 1.7 nm from Westfield church spire.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1000 your fix is 087°T, 1.9 nm from Heron Point Light. You steer 355°T at 7.3 kn through the water. At 1045 a new fix puts you 277°T, 2.8 nm from Tern Island tower.

   Plot the 1045 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 0740 your fix is 228°T, 2.3 nm from Tern Island tower. You steer 293°T at 4.9 kn through the water. At 0835 a new fix puts you 096°T, 1.8 nm from Westfield church spire.

   Plot the 0835 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  

5. At 0730 your fix is 044°T, 3.7 nm from Gannet Rock daybeacon. You steer 315°T at 5.3 kn through the water. At 0800 a new fix puts you 048°T, 3.7 nm from Tern Island tower.

   Plot the 0800 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  

6. At 1255 your fix is 132°T, 1.5 nm from Tern Island tower. You steer 237°T at 8.1 kn through the water. At 1325 a new fix puts you 350°T, 2.7 nm from Mill stack.

   Plot the 1325 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 1505 your fix is 268°T, 2.3 nm from Tern Island tower. You steer 198°T at 7.9 kn through the water. At 1535 a new fix puts you 070°T, 2.3 nm from Heron Point Light.

   Plot the 1535 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  

8. At 1320 your fix is 136°T, 1.4 nm from Westfield church spire. You steer 033°T at 4.1 kn through the water. At 1405 a new fix puts you 051°T, 3.5 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn