Worksheet 881 · Skill 5

Set and drift

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1. At 1335 your fix is 056°T, 1.3 nm from Westfield church spire. You steer 090°T at 8.3 kn through the water. At 1410 a new fix puts you 267°T, 1.8 nm from Tern Island tower.

   Plot the 1410 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 1025 your fix is 002°T, 2.2 nm from Mill stack. You steer 304°T at 8.5 kn through the water. At 1105 a new fix puts you 125°T, 1.4 nm from Westfield church spire.

   Plot the 1105 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  

3. At 0735 your fix is 038°T, 2.4 nm from Kittle water tank. You steer 278°T at 6.2 kn through the water. At 0840 a new fix puts you 199°T, 2.5 nm from Tern Island tower.

   Plot the 0840 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  

4. At 1535 your fix is 036°T, 3.8 nm from Gannet Rock daybeacon. You steer 227°T at 6.2 kn through the water. At 1640 a new fix puts you 250°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 1640 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  

5. At 1140 your fix is 035°T, 3.6 nm from Gannet Rock daybeacon. You steer 244°T at 4.7 kn through the water. At 1305 a new fix puts you 063°T, 2.8 nm from Heron Point Light.

   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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1005 your fix is 039°T, 4.4 nm from Westfield church spire. You steer 095°T at 4.3 kn through the water. At 1135 a new fix puts you 359°T, 2.1 nm from Tern Island tower.

   Plot the 1135 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1350 your fix is 043°T, 4.3 nm from Gannet Rock daybeacon. You steer 253°T at 4.5 kn through the water. At 1435 a new fix puts you 018°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 1435 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 0715 your fix is 237°T, 3.5 nm from Tern Island tower. You steer 095°T at 5.7 kn through the water. At 0745 a new fix puts you 272°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 0745 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