Worksheet 877 · Skill 5

Set and drift

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1. At 1410 your fix is 003°T, 1.5 nm from Heron Point Light. You steer 359°T at 7.2 kn through the water. At 1445 a new fix puts you 027°T, 3.1 nm from Westfield church spire.

   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  

2. At 0840 your fix is 099°T, 1.5 nm from Westfield church spire. You steer 000°T at 4.2 kn through the water. At 0930 a new fix puts you 019°T, 2.9 nm from Westfield church spire.

   Plot the 0930 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  

3. At 1105 your fix is 208°T, 1.8 nm from Tern Island tower. You steer 250°T at 4.4 kn through the water. At 1200 a new fix puts you 040°T, 2.2 nm from Heron Point Light.

   Plot the 1200 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  

4. At 1035 your fix is 094°T, 1.9 nm from Heron Point Light. You steer 014°T at 4.1 kn through the water. At 1155 a new fix puts you 059°T, 3.5 nm from Westfield church spire.

   Plot the 1155 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0710 your fix is 039°T, 1.5 nm from Heron Point Light. You steer 093°T at 7.3 kn through the water. At 0815 a new fix puts you 037°T, 1.5 nm from Kittle water tank.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1030 your fix is 237°T, 2.2 nm from Tern Island tower. You steer 021°T at 4.8 kn through the water. At 1100 a new fix puts you 311°T, 2.7 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1140 your fix is 055°T, 3.7 nm from Tern Island tower. You steer 168°T at 4.9 kn through the water. At 1225 a new fix puts you 077°T, 3.0 nm from Gannet Rock daybeacon.

   Plot the 1225 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  

8. At 0700 your fix is 032°T, 2.2 nm from Heron Point Light. You steer 285°T at 4.2 kn through the water. At 0740 a new fix puts you 102°T, 0.9 nm from Westfield church spire.

   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