Worksheet 575 · Skill 5

Set and drift

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1. At 1015 your fix is 035°T, 2.0 nm from Kittle water tank. You steer 354°T at 7.7 kn through the water. At 1050 a new fix puts you 044°T, 4.5 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1510 your fix is 089°T, 2.5 nm from Westfield church spire. You steer 005°T at 6.2 kn through the water. At 1540 a new fix puts you 290°T, 4.0 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1405 your fix is 023°T, 1.9 nm from Tern Island tower. You steer 145°T at 4.8 kn through the water. At 1450 a new fix puts you 006°T, 1.6 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1505 your fix is 240°T, 3.4 nm from Tern Island tower. You steer 090°T at 7.6 kn through the water. At 1545 a new fix puts you 047°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 1545 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 1140 your fix is 262°T, 2.3 nm from Tern Island tower. You steer 052°T at 4.5 kn through the water. At 1230 a new fix puts you 335°T, 2.2 nm from Tern Island tower.

   Plot the 1230 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 1250 your fix is 069°T, 3.7 nm from Tern Island tower. You steer 213°T at 6.4 kn through the water. At 1405 a new fix puts you 035°T, 1.9 nm from Mill stack.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0835 your fix is 011°T, 2.0 nm from Gannet Rock daybeacon. You steer 215°T at 4.0 kn through the water. At 0935 a new fix puts you 035°T, 2.2 nm from Mill stack.

   Plot the 0935 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  

8. At 1415 your fix is 240°T, 2.2 nm from Tern Island tower. You steer 305°T at 6.9 kn through the water. At 1450 a new fix puts you 038°T, 4.1 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn