Worksheet 640 · Skill 5

Set and drift

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1. At 0855 your fix is 015°T, 1.6 nm from Westfield church spire. You steer 126°T at 4.2 kn through the water. At 0925 a new fix puts you 012°T, 2.6 nm from Heron Point Light.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1325 your fix is 081°T, 2.2 nm from Westfield church spire. You steer 322°T at 5.0 kn through the water. At 1400 a new fix puts you 006°T, 1.5 nm from Westfield church spire.

   Plot the 1400 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  

3. At 1540 your fix is 303°T, 4.2 nm from Tern Island tower. You steer 244°T at 4.4 kn through the water. At 1620 a new fix puts you 049°T, 1.3 nm from Westfield church spire.

   Plot the 1620 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 1055 your fix is 007°T, 3.0 nm from Mill stack. You steer 338°T at 7.4 kn through the water. At 1135 a new fix puts you 284°T, 3.5 nm from Tern Island tower.

   Plot the 1135 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  

5. At 1220 your fix is 197°T, 1.7 nm from Tern Island tower. You steer 262°T at 4.9 kn through the water. At 1300 a new fix puts you 063°T, 3.2 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1505 your fix is 242°T, 1.7 nm from Tern Island tower. You steer 252°T at 4.4 kn through the water. At 1610 a new fix puts you 091°T, 2.7 nm from Westfield church spire.

   Plot the 1610 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0950 your fix is 086°T, 1.3 nm from Gannet Rock daybeacon. You steer 327°T at 7.7 kn through the water. At 1030 a new fix puts you 006°T, 2.4 nm from Tern Island tower.

   Plot the 1030 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 1425 your fix is 019°T, 2.1 nm from Gannet Rock daybeacon. You steer 168°T at 6.1 kn through the water. At 1455 a new fix puts you 356°T, 1.7 nm from Kittle water tank.

   Plot the 1455 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