Worksheet 323 · Skill 5

Set and drift

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1. At 1300 your fix is 254°T, 2.4 nm from Tern Island tower. You steer 309°T at 4.6 kn through the water. At 1335 a new fix puts you 046°T, 3.1 nm from Westfield church spire.

   Plot the 1335 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 053°T, 2.6 nm from Mill stack. You steer 014°T at 6.1 kn through the water. At 1030 a new fix puts you 308°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1030 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  

3. At 1405 your fix is 040°T, 1.3 nm from Kittle water tank. You steer 278°T at 8.7 kn through the water. At 1445 a new fix puts you 009°T, 2.8 nm from Mill stack.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0700 your fix is 038°T, 1.1 nm from Kittle water tank. You steer 284°T at 7.7 kn through the water. At 0810 a new fix puts you 167°T, 1.7 nm from Westfield church spire.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0925 your fix is 079°T, 2.1 nm from Westfield church spire. You steer 111°T at 8.0 kn through the water. At 0955 a new fix puts you 234°T, 2.7 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1520 your fix is 032°T, 2.8 nm from Heron Point Light. You steer 305°T at 4.3 kn through the water. At 1615 a new fix puts you 045°T, 2.1 nm from Westfield church spire.

   Plot the 1615 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  

7. At 1110 your fix is 033°T, 4.0 nm from Westfield church spire. You steer 151°T at 5.5 kn through the water. At 1140 a new fix puts you 087°T, 3.1 nm from Westfield church spire.

   Plot the 1140 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 1525 your fix is 021°T, 2.9 nm from Westfield church spire. You steer 157°T at 5.9 kn through the water. At 1610 a new fix puts you 024°T, 2.7 nm from Heron Point Light.

   Plot the 1610 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