Worksheet 38 · Skill 5

Set and drift

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1. At 1205 your fix is 156°T, 0.9 nm from Westfield church spire. You steer 121°T at 6.0 kn through the water. At 1235 a new fix puts you 094°T, 1.1 nm from Heron Point Light.

   Plot the 1235 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 0925 your fix is 037°T, 2.2 nm from Kittle water tank. You steer 322°T at 8.2 kn through the water. At 1000 a new fix puts you 048°T, 1.6 nm from Tern Island tower.

   Plot the 1000 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 1315 your fix is 055°T, 3.1 nm from Tern Island tower. You steer 276°T at 7.1 kn through the water. At 1415 a new fix puts you 296°T, 4.1 nm from Tern Island tower.

   Plot the 1415 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  

4. At 1100 your fix is 303°T, 4.0 nm from Tern Island tower. You steer 253°T at 5.3 kn through the water. At 1130 a new fix puts you 036°T, 2.2 nm from Westfield church spire.

   Plot the 1130 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 0950 your fix is 194°T, 1.6 nm from Tern Island tower. You steer 069°T at 4.0 kn through the water. At 1055 a new fix puts you 137°T, 2.8 nm from Tern Island tower.

   Plot the 1055 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 1040 your fix is 042°T, 2.0 nm from Gannet Rock daybeacon. You steer 244°T at 7.4 kn through the water. At 1125 a new fix puts you 001°T, 3.2 nm from Mill stack.

   Plot the 1125 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 0815 your fix is 080°T, 2.8 nm from Gannet Rock daybeacon. You steer 302°T at 5.3 kn through the water. At 0855 a new fix puts you 135°T, 2.5 nm from Tern Island tower.

   Plot the 0855 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  

8. At 1025 your fix is 041°T, 3.5 nm from Heron Point Light. You steer 335°T at 4.0 kn through the water. At 1105 a new fix puts you 084°T, 2.9 nm from Westfield church spire.

   Plot the 1105 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