Worksheet 930 · Skill 5

Set and drift

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1. At 1510 your fix is 063°T, 5.3 nm from Tern Island tower. You steer 198°T at 4.6 kn through the water. At 1610 a new fix puts you 018°T, 2.1 nm from Gannet Rock daybeacon.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1205 your fix is 101°T, 2.5 nm from Westfield church spire. You steer 134°T at 5.2 kn through the water. At 1240 a new fix puts you 052°T, 3.3 nm from Heron Point Light.

   Plot the 1240 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 0720 your fix is 095°T, 1.9 nm from Tern Island tower. You steer 058°T at 5.7 kn through the water. At 0750 a new fix puts you 062°T, 4.1 nm from Tern Island tower.

   Plot the 0750 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 1145 your fix is 258°T, 2.4 nm from Gannet Rock daybeacon. You steer 294°T at 7.4 kn through the water. At 1235 a new fix puts you 071°T, 2.7 nm from Westfield church spire.

   Plot the 1235 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  

5. At 1540 your fix is 246°T, 3.6 nm from Tern Island tower. You steer 036°T at 8.1 kn through the water. At 1615 a new fix puts you 016°T, 2.5 nm from Tern Island tower.

   Plot the 1615 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  

6. At 1535 your fix is 006°T, 2.2 nm from Westfield church spire. You steer 123°T at 8.3 kn through the water. At 1635 a new fix puts you 015°T, 2.1 nm from Mill stack.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0740 your fix is 349°T, 2.1 nm from Mill stack. You steer 053°T at 5.0 kn through the water. At 0825 a new fix puts you 303°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 0825 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  

8. At 1350 your fix is 347°T, 1.8 nm from Mill stack. You steer 005°T at 5.3 kn through the water. At 1425 a new fix puts you 205°T, 1.7 nm from Tern Island tower.

   Plot the 1425 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