Worksheet 725 · Skill 5

Set and drift

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1. At 1220 your fix is 100°T, 2.6 nm from Westfield church spire. You steer 156°T at 5.6 kn through the water. At 1250 a new fix puts you 070°T, 2.5 nm from Heron Point Light.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1225 your fix is 321°T, 2.1 nm from Mill stack. You steer 049°T at 6.9 kn through the water. At 1255 a new fix puts you 214°T, 2.3 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1200 your fix is 287°T, 2.2 nm from Tern Island tower. You steer 198°T at 7.7 kn through the water. At 1245 a new fix puts you 074°T, 1.3 nm from Heron Point Light.

   Plot the 1245 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 1545 your fix is 090°T, 1.3 nm from Gannet Rock daybeacon. You steer 334°T at 4.0 kn through the water. At 1615 a new fix puts you 084°T, 1.7 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0835 your fix is 191°T, 0.9 nm from Gannet Rock daybeacon. You steer 300°T at 4.2 kn through the water. At 0925 a new fix puts you 251°T, 3.1 nm from Tern Island tower.

   Plot the 0925 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  

6. At 0950 your fix is 009°T, 1.1 nm from Gannet Rock daybeacon. You steer 138°T at 5.7 kn through the water. At 1035 a new fix puts you 359°T, 0.9 nm from Kittle water tank.

   Plot the 1035 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 1010 your fix is 032°T, 2.8 nm from Heron Point Light. You steer 113°T at 6.3 kn through the water. At 1040 a new fix puts you 029°T, 2.2 nm from Mill stack.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0945 your fix is 345°T, 2.2 nm from Mill stack. You steer 322°T at 4.0 kn through the water. At 1045 a new fix puts you 054°T, 3.4 nm from Westfield church spire.

   Plot the 1045 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