Worksheet 438 · Skill 5

Set and drift

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1. At 1305 your fix is 153°T, 1.2 nm from Gannet Rock daybeacon. You steer 295°T at 6.7 kn through the water. At 1405 a new fix puts you 052°T, 2.6 nm from Heron Point Light.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1015 your fix is 065°T, 1.9 nm from Westfield church spire. You steer 110°T at 7.4 kn through the water. At 1130 a new fix puts you 156°T, 2.7 nm from Tern Island tower.

   Plot the 1130 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 0845 your fix is 053°T, 2.2 nm from Heron Point Light. You steer 097°T at 7.9 kn through the water. At 0925 a new fix puts you 323°T, 2.8 nm from Kittle water tank.

   Plot the 0925 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  

4. At 0725 your fix is 090°T, 1.2 nm from Gannet Rock daybeacon. You steer 233°T at 6.2 kn through the water. At 0810 a new fix puts you 060°T, 1.7 nm from Mill stack.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1545 your fix is 295°T, 2.0 nm from Tern Island tower. You steer 236°T at 6.1 kn through the water. At 1635 a new fix puts you 091°T, 1.5 nm from Westfield church spire.

   Plot the 1635 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  

6. At 0850 your fix is 015°T, 2.8 nm from Mill stack. You steer 336°T at 6.1 kn through the water. At 0920 a new fix puts you 229°T, 1.7 nm from Tern Island tower.

   Plot the 0920 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 1420 your fix is 312°T, 3.5 nm from Tern Island tower. You steer 201°T at 5.2 kn through the water. At 1450 a new fix puts you 060°T, 3.6 nm from Westfield church spire.

   Plot the 1450 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 1240 your fix is 034°T, 1.9 nm from Mill stack. You steer 331°T at 7.6 kn through the water. At 1315 a new fix puts you 234°T, 3.5 nm from Tern Island tower.

   Plot the 1315 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