Worksheet 160 · Skill 5

Set and drift

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1. At 1345 your fix is 331°T, 2.2 nm from Mill stack. You steer 052°T at 4.4 kn through the water. At 1455 a new fix puts you 036°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1455 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  

2. At 0710 your fix is 047°T, 3.5 nm from Heron Point Light. You steer 031°T at 6.5 kn through the water. At 0755 a new fix puts you 358°T, 2.5 nm from Tern Island tower.

   Plot the 0755 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 0820 your fix is 039°T, 1.0 nm from Westfield church spire. You steer 130°T at 4.2 kn through the water. At 0930 a new fix puts you 058°T, 3.0 nm from Heron Point Light.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0900 your fix is 100°T, 1.7 nm from Tern Island tower. You steer 046°T at 4.9 kn through the water. At 0935 a new fix puts you 062°T, 4.7 nm from Tern Island tower.

   Plot the 0935 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  

5. At 0725 your fix is 292°T, 1.4 nm from Tern Island tower. You steer 302°T at 6.2 kn through the water. At 0800 a new fix puts you 308°T, 4.0 nm from Tern Island tower.

   Plot the 0800 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  

6. At 1125 your fix is 302°T, 1.6 nm from Tern Island tower. You steer 284°T at 5.6 kn through the water. At 1205 a new fix puts you 057°T, 3.6 nm from Westfield church spire.

   Plot the 1205 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  

7. At 1300 your fix is 230°T, 2.0 nm from Gannet Rock daybeacon. You steer 084°T at 6.2 kn through the water. At 1335 a new fix puts you 057°T, 1.8 nm from Kittle water tank.

   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  

8. At 1130 your fix is 060°T, 3.3 nm from Westfield church spire. You steer 126°T at 5.6 kn through the water. At 1240 a new fix puts you 288°T, 2.0 nm from Kittle water tank.

   Plot the 1240 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