Worksheet 875 · Skill 5

Set and drift

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1. At 1145 your fix is 320°T, 2.4 nm from Tern Island tower. You steer 238°T at 5.5 kn through the water. At 1230 a new fix puts you 058°T, 3.3 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1050 your fix is 324°T, 1.2 nm from Gannet Rock daybeacon. You steer 047°T at 7.6 kn through the water. At 1120 a new fix puts you 038°T, 3.6 nm from Gannet Rock daybeacon.

   Plot the 1120 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 1505 your fix is 024°T, 2.1 nm from Gannet Rock daybeacon. You steer 243°T at 8.3 kn through the water. At 1550 a new fix puts you 346°T, 1.7 nm from Mill stack.

   Plot the 1550 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 1420 your fix is 206°T, 2.1 nm from Gannet Rock daybeacon. You steer 290°T at 5.2 kn through the water. At 1540 a new fix puts you 136°T, 1.2 nm from Westfield church spire.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1155 your fix is 306°T, 3.5 nm from Tern Island tower. You steer 250°T at 4.1 kn through the water. At 1305 a new fix puts you 052°T, 3.6 nm from Westfield church spire.

   Plot the 1305 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  

6. At 0915 your fix is 010°T, 1.8 nm from Gannet Rock daybeacon. You steer 166°T at 5.6 kn through the water. At 1000 a new fix puts you 055°T, 1.2 nm from Kittle water tank.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1440 your fix is 354°T, 1.7 nm from Tern Island tower. You steer 082°T at 8.6 kn through the water. At 1510 a new fix puts you 060°T, 4.2 nm from Tern Island tower.

   Plot the 1510 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 1250 your fix is 290°T, 1.3 nm from Tern Island tower. You steer 292°T at 4.8 kn through the water. At 1335 a new fix puts you 048°T, 4.4 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn