Worksheet 873 · Skill 5

Set and drift

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1. At 1350 your fix is 348°T, 1.3 nm from Tern Island tower. You steer 239°T at 4.0 kn through the water. At 1500 a new fix puts you 070°T, 3.5 nm from Westfield church spire.

   Plot the 1500 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  

2. At 1440 your fix is 275°T, 2.1 nm from Gannet Rock daybeacon. You steer 216°T at 4.0 kn through the water. At 1510 a new fix puts you 024°T, 2.6 nm from Mill stack.

   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  

3. At 1045 your fix is 045°T, 2.1 nm from Kittle water tank. You steer 264°T at 4.1 kn through the water. At 1155 a new fix puts you 352°T, 3.3 nm from Mill stack.

   Plot the 1155 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  

4. At 1345 your fix is 033°T, 2.4 nm from Kittle water tank. You steer 336°T at 6.0 kn through the water. At 1440 a new fix puts you 047°T, 3.3 nm from Tern Island tower.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0840 your fix is 038°T, 2.0 nm from Mill stack. You steer 029°T at 4.8 kn through the water. At 0935 a new fix puts you 075°T, 1.7 nm from Gannet Rock daybeacon.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1230 your fix is 326°T, 1.3 nm from Tern Island tower. You steer 230°T at 6.5 kn through the water. At 1330 a new fix puts you 017°T, 1.2 nm from Heron Point Light.

   Plot the 1330 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  

7. At 1150 your fix is 272°T, 1.6 nm from Tern Island tower. You steer 281°T at 7.4 kn through the water. At 1225 a new fix puts you 043°T, 2.8 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1200 your fix is 038°T, 2.9 nm from Westfield church spire. You steer 159°T at 9.0 kn through the water. At 1235 a new fix puts you 326°T, 1.8 nm from Mill stack.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn