Worksheet 860 · Skill 5

Set and drift

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1. At 0825 your fix is 021°T, 2.7 nm from Westfield church spire. You steer 153°T at 7.6 kn through the water. At 0905 a new fix puts you 052°T, 3.5 nm from Heron Point Light.

   Plot the 0905 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  

2. At 0825 your fix is 014°T, 3.1 nm from Westfield church spire. You steer 111°T at 4.9 kn through the water. At 0910 a new fix puts you 056°T, 3.3 nm from Westfield church spire.

   Plot the 0910 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  

3. At 1135 your fix is 253°T, 2.8 nm from Gannet Rock daybeacon. You steer 313°T at 4.4 kn through the water. At 1235 a new fix puts you 091°T, 3.6 nm from Westfield church spire.

   Plot the 1235 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  

4. At 1530 your fix is 185°T, 1.2 nm from Tern Island tower. You steer 149°T at 8.6 kn through the water. At 1600 a new fix puts you 294°T, 2.1 nm from Kittle water tank.

   Plot the 1600 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  

5. At 1410 your fix is 030°T, 3.2 nm from Westfield church spire. You steer 129°T at 4.3 kn through the water. At 1455 a new fix puts you 258°T, 2.3 nm from Tern Island tower.

   Plot the 1455 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 1145 your fix is 283°T, 2.4 nm from Tern Island tower. You steer 284°T at 4.6 kn through the water. At 1225 a new fix puts you 043°T, 2.4 nm from Westfield church spire.

   Plot the 1225 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  

7. At 1145 your fix is 043°T, 3.7 nm from Gannet Rock daybeacon. You steer 182°T at 4.5 kn through the water. At 1220 a new fix puts you 073°T, 2.8 nm from Gannet Rock daybeacon.

   Plot the 1220 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  

8. At 1035 your fix is 338°T, 1.7 nm from Tern Island tower. You steer 098°T at 4.6 kn through the water. At 1120 a new fix puts you 083°T, 3.1 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn