Worksheet 924 · Skill 5

Set and drift

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1. At 1210 your fix is 148°T, 1.4 nm from Gannet Rock daybeacon. You steer 307°T at 6.2 kn through the water. At 1340 a new fix puts you 102°T, 1.6 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1220 your fix is 016°T, 1.9 nm from Mill stack. You steer 326°T at 8.3 kn through the water. At 1315 a new fix puts you 039°T, 4.6 nm from Westfield church spire.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0940 your fix is 040°T, 3.1 nm from Heron Point Light. You steer 042°T at 4.6 kn through the water. At 1025 a new fix puts you 268°T, 2.4 nm from Tern Island tower.

   Plot the 1025 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  

4. At 1345 your fix is 171°T, 1.1 nm from Westfield church spire. You steer 050°T at 4.1 kn through the water. At 1425 a new fix puts you 069°T, 3.3 nm from Westfield church spire.

   Plot the 1425 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  

5. At 0715 your fix is 028°T, 1.7 nm from Kittle water tank. You steer 354°T at 4.9 kn through the water. At 0815 a new fix puts you 086°T, 2.2 nm from Tern Island tower.

   Plot the 0815 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  

6. At 1445 your fix is 076°T, 2.9 nm from Westfield church spire. You steer 147°T at 8.5 kn through the water. At 1520 a new fix puts you 319°T, 2.0 nm from Mill stack.

   Plot the 1520 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 0800 your fix is 252°T, 3.4 nm from Tern Island tower. You steer 285°T at 6.7 kn through the water. At 0835 a new fix puts you 038°T, 2.0 nm from Westfield church spire.

   Plot the 0835 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 1410 your fix is 192°T, 2.2 nm from Tern Island tower. You steer 301°T at 6.8 kn through the water. At 1505 a new fix puts you 359°T, 1.9 nm from Westfield church spire.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn