Worksheet 755 · Skill 5

Set and drift

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1. At 0700 your fix is 039°T, 2.7 nm from Westfield church spire. You steer 125°T at 5.7 kn through the water. At 0740 a new fix puts you 225°T, 3.2 nm from Tern Island tower.

   Plot the 0740 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 1020 your fix is 283°T, 1.5 nm from Gannet Rock daybeacon. You steer 296°T at 5.0 kn through the water. At 1100 a new fix puts you 094°T, 3.2 nm from Westfield church spire.

   Plot the 1100 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 1340 your fix is 142°T, 1.3 nm from Westfield church spire. You steer 089°T at 8.3 kn through the water. At 1440 a new fix puts you 326°T, 1.3 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1040 your fix is 350°T, 1.1 nm from Heron Point Light. You steer 008°T at 6.0 kn through the water. At 1130 a new fix puts you 041°T, 4.6 nm from Westfield church spire.

   Plot the 1130 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1235 your fix is 270°T, 2.3 nm from Tern Island tower. You steer 149°T at 6.6 kn through the water. At 1315 a new fix puts you 013°T, 2.5 nm from Mill stack.

   Plot the 1315 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  

6. At 1310 your fix is 244°T, 1.8 nm from Tern Island tower. You steer 158°T at 5.2 kn through the water. At 1345 a new fix puts you 003°T, 3.1 nm from Mill stack.

   Plot the 1345 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  

7. At 0940 your fix is 035°T, 2.5 nm from Westfield church spire. You steer 145°T at 4.7 kn through the water. At 1010 a new fix puts you 095°T, 2.6 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1115 your fix is 196°T, 2.4 nm from Tern Island tower. You steer 150°T at 5.1 kn through the water. At 1145 a new fix puts you 291°T, 2.1 nm from Kittle water tank.

   Plot the 1145 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