Worksheet 632 · Skill 5

Set and drift

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1. At 1155 your fix is 264°T, 1.2 nm from Gannet Rock daybeacon. You steer 047°T at 7.5 kn through the water. At 1230 a new fix puts you 034°T, 2.4 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0915 your fix is 075°T, 3.0 nm from Westfield church spire. You steer 111°T at 5.1 kn through the water. At 1010 a new fix puts you 191°T, 1.3 nm from Tern Island tower.

   Plot the 1010 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  

3. At 1320 your fix is 051°T, 3.7 nm from Gannet Rock daybeacon. You steer 203°T at 4.9 kn through the water. At 1400 a new fix puts you 022°T, 2.2 nm from Kittle water tank.

   Plot the 1400 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  

4. At 1330 your fix is 026°T, 2.2 nm from Mill stack. You steer 030°T at 4.5 kn through the water. At 1440 a new fix puts you 327°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1440 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  

5. At 1245 your fix is 024°T, 1.9 nm from Heron Point Light. You steer 124°T at 6.6 kn through the water. At 1320 a new fix puts you 058°T, 2.0 nm from Mill stack.

   Plot the 1320 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 1300 your fix is 323°T, 2.4 nm from Tern Island tower. You steer 180°T at 6.8 kn through the water. At 1355 a new fix puts you 226°T, 3.4 nm from Tern Island tower.

   Plot the 1355 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  

7. At 1545 your fix is 025°T, 3.2 nm from Heron Point Light. You steer 322°T at 4.0 kn through the water. At 1630 a new fix puts you 052°T, 1.6 nm from Westfield church spire.

   Plot the 1630 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 0935 your fix is 302°T, 2.9 nm from Tern Island tower. You steer 170°T at 5.7 kn through the water. At 1030 a new fix puts you 000°T, 1.9 nm from Mill stack.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn