Worksheet 874 · Skill 5

Set and drift

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1. At 1445 your fix is 052°T, 2.9 nm from Tern Island tower. You steer 171°T at 6.1 kn through the water. At 1540 a new fix puts you 149°T, 1.0 nm from Gannet Rock daybeacon.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1300 your fix is 039°T, 1.6 nm from Westfield church spire. You steer 127°T at 7.6 kn through the water. At 1335 a new fix puts you 005°T, 3.2 nm from Mill stack.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1210 your fix is 092°T, 2.6 nm from Westfield church spire. You steer 058°T at 8.7 kn through the water. At 1240 a new fix puts you 311°T, 2.2 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1325 your fix is 039°T, 2.1 nm from Kittle water tank. You steer 334°T at 5.8 kn through the water. At 1415 a new fix puts you 041°T, 3.4 nm from Gannet Rock daybeacon.

   Plot the 1415 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 1510 your fix is 305°T, 3.2 nm from Tern Island tower. You steer 088°T at 6.8 kn through the water. At 1545 a new fix puts you 052°T, 3.5 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0855 your fix is 207°T, 2.0 nm from Gannet Rock daybeacon. You steer 318°T at 4.8 kn through the water. At 1000 a new fix puts you 087°T, 3.4 nm from Westfield church spire.

   Plot the 1000 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 1145 your fix is 098°T, 2.5 nm from Westfield church spire. You steer 118°T at 5.3 kn through the water. At 1250 a new fix puts you 040°T, 2.2 nm from Mill stack.

   Plot the 1250 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  

8. At 1255 your fix is 013°T, 2.2 nm from Tern Island tower. You steer 117°T at 7.3 kn through the water. At 1335 a new fix puts you 040°T, 4.3 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn