Worksheet 698 · Skill 5

Set and drift

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1. At 1140 your fix is 041°T, 1.3 nm from Kittle water tank. You steer 286°T at 7.2 kn through the water. At 1255 a new fix puts you 090°T, 3.5 nm from Westfield church spire.

   Plot the 1255 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1225 your fix is 010°T, 2.4 nm from Tern Island tower. You steer 155°T at 6.4 kn through the water. At 1340 a new fix puts you 094°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 1340 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1305 your fix is 228°T, 2.0 nm from Gannet Rock daybeacon. You steer 332°T at 7.4 kn through the water. At 1345 a new fix puts you 270°T, 2.5 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1435 your fix is 054°T, 2.0 nm from Kittle water tank. You steer 271°T at 8.8 kn through the water. At 1505 a new fix puts you 220°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 1505 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 1420 your fix is 339°T, 2.1 nm from Mill stack. You steer 094°T at 4.9 kn through the water. At 1500 a new fix puts you 060°T, 2.3 nm from Mill stack.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0920 your fix is 342°T, 1.2 nm from Heron Point Light. You steer 032°T at 4.0 kn through the water. At 0955 a new fix puts you 020°T, 2.2 nm from Heron Point Light.

   Plot the 0955 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 0720 your fix is 101°T, 1.0 nm from Westfield church spire. You steer 089°T at 6.1 kn through the water. At 0810 a new fix puts you 210°T, 1.8 nm from Tern Island tower.

   Plot the 0810 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  

8. At 1210 your fix is 109°T, 1.6 nm from Westfield church spire. You steer 042°T at 6.1 kn through the water. At 1250 a new fix puts you 049°T, 4.4 nm from Westfield church spire.

   Plot the 1250 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