Worksheet 901 · Skill 5

Set and drift

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1. At 1000 your fix is 058°T, 4.1 nm from Tern Island tower. You steer 164°T at 5.7 kn through the water. At 1100 a new fix puts you 106°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 1100 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 0905 your fix is 196°T, 2.0 nm from Gannet Rock daybeacon. You steer 299°T at 5.0 kn through the water. At 1030 a new fix puts you 062°T, 2.2 nm from Westfield church spire.

   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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1225 your fix is 047°T, 3.0 nm from Tern Island tower. You steer 137°T at 6.9 kn through the water. At 1300 a new fix puts you 056°T, 3.7 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0955 your fix is 025°T, 3.9 nm from Westfield church spire. You steer 133°T at 5.2 kn through the water. At 1055 a new fix puts you 093°T, 3.4 nm from Westfield church spire.

   Plot the 1055 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  

5. At 0945 your fix is 004°T, 3.2 nm from Mill stack. You steer 092°T at 6.9 kn through the water. At 1030 a new fix puts you 038°T, 0.9 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1505 your fix is 212°T, 2.9 nm from Tern Island tower. You steer 225°T at 4.3 kn through the water. At 1540 a new fix puts you 347°T, 3.2 nm from Mill stack.

   Plot the 1540 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  

7. At 1305 your fix is 018°T, 1.8 nm from Heron Point Light. You steer 350°T at 6.2 kn through the water. At 1335 a new fix puts you 063°T, 3.1 nm from Westfield church spire.

   Plot the 1335 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 1420 your fix is 073°T, 3.0 nm from Gannet Rock daybeacon. You steer 235°T at 5.3 kn through the water. At 1530 a new fix puts you 000°T, 1.2 nm from Mill stack.

   Plot the 1530 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn