Worksheet 211 · Skill 5

Set and drift

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1. At 1050 your fix is 023°T, 2.6 nm from Heron Point Light. You steer 093°T at 8.3 kn through the water. At 1125 a new fix puts you 242°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 1125 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 0955 your fix is 358°T, 1.8 nm from Tern Island tower. You steer 228°T at 7.3 kn through the water. At 1040 a new fix puts you 094°T, 3.2 nm from Westfield church spire.

   Plot the 1040 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 1410 your fix is 271°T, 2.0 nm from Tern Island tower. You steer 161°T at 4.9 kn through the water. At 1445 a new fix puts you 248°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 1445 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  

4. At 1430 your fix is 101°T, 2.3 nm from Westfield church spire. You steer 129°T at 5.0 kn through the water. At 1535 a new fix puts you 041°T, 2.3 nm from Mill stack.

   Plot the 1535 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 1415 your fix is 036°T, 4.7 nm from Gannet Rock daybeacon. You steer 203°T at 4.2 kn through the water. At 1545 a new fix puts you 200°T, 2.2 nm from Tern Island tower.

   Plot the 1545 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  

6. At 1255 your fix is 039°T, 2.4 nm from Tern Island tower. You steer 266°T at 8.8 kn through the water. At 1340 a new fix puts you 068°T, 3.0 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1305 your fix is 042°T, 1.7 nm from Kittle water tank. You steer 272°T at 4.2 kn through the water. At 1435 a new fix puts you 335°T, 2.5 nm from Mill stack.

   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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1550 your fix is 334°T, 2.1 nm from Tern Island tower. You steer 103°T at 8.0 kn through the water. At 1625 a new fix puts you 032°T, 3.5 nm from Gannet Rock daybeacon.

   Plot the 1625 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