Worksheet 643 · Skill 5

Set and drift

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1. At 1510 your fix is 047°T, 4.2 nm from Westfield church spire. You steer 074°T at 4.2 kn through the water. At 1550 a new fix puts you 349°T, 2.5 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  

2. At 0850 your fix is 358°T, 1.8 nm from Mill stack. You steer 305°T at 6.1 kn through the water. At 0945 a new fix puts you 356°T, 1.6 nm from Heron Point Light.

   Plot the 0945 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  

3. At 0740 your fix is 229°T, 2.6 nm from Gannet Rock daybeacon. You steer 314°T at 5.4 kn through the water. At 0810 a new fix puts you 231°T, 3.5 nm from Tern Island tower.

   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  

4. At 1355 your fix is 217°T, 3.1 nm from Tern Island tower. You steer 321°T at 8.3 kn through the water. At 1430 a new fix puts you 276°T, 3.8 nm from Tern Island tower.

   Plot the 1430 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 1320 your fix is 003°T, 1.5 nm from Westfield church spire. You steer 096°T at 6.5 kn through the water. At 1350 a new fix puts you 079°T, 2.9 nm from Westfield church spire.

   Plot the 1350 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 1235 your fix is 111°T, 2.0 nm from Gannet Rock daybeacon. You steer 015°T at 8.9 kn through the water. At 1305 a new fix puts you 064°T, 5.1 nm from Tern Island tower.

   Plot the 1305 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 1010 your fix is 060°T, 2.7 nm from Heron Point Light. You steer 326°T at 5.5 kn through the water. At 1050 a new fix puts you 100°T, 2.7 nm from Westfield church spire.

   Plot the 1050 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 1600 your fix is 014°T, 3.2 nm from Westfield church spire. You steer 133°T at 4.0 kn through the water. At 1630 a new fix puts you 058°T, 3.1 nm from Westfield church spire.

   Plot the 1630 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