Worksheet 391 · Skill 5

Set and drift

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1. At 1210 your fix is 232°T, 3.0 nm from Tern Island tower. You steer 310°T at 6.9 kn through the water. At 1305 a new fix puts you 005°T, 2.0 nm from Westfield church spire.

   Plot the 1305 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  

2. At 1020 your fix is 042°T, 3.4 nm from Westfield church spire. You steer 171°T at 4.5 kn through the water. At 1145 a new fix puts you 051°T, 3.3 nm from Heron Point Light.

   Plot the 1145 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1250 your fix is 054°T, 1.4 nm from Westfield church spire. You steer 132°T at 4.4 kn through the water. At 1410 a new fix puts you 072°T, 1.1 nm from Heron Point Light.

   Plot the 1410 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  

4. At 1510 your fix is 068°T, 2.3 nm from Gannet Rock daybeacon. You steer 260°T at 6.7 kn through the water. At 1540 a new fix puts you 163°T, 1.3 nm from Tern Island tower.

   Plot the 1540 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 0945 your fix is 031°T, 3.3 nm from Heron Point Light. You steer 113°T at 4.0 kn through the water. At 1015 a new fix puts you 209°T, 3.1 nm from Tern Island tower.

   Plot the 1015 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 1040 your fix is 044°T, 2.3 nm from Westfield church spire. You steer 082°T at 5.4 kn through the water. At 1140 a new fix puts you 259°T, 1.7 nm from Tern Island tower.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1055 your fix is 042°T, 2.9 nm from Heron Point Light. You steer 121°T at 4.0 kn through the water. At 1210 a new fix puts you 206°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1210 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0835 your fix is 286°T, 1.3 nm from Gannet Rock daybeacon. You steer 252°T at 8.2 kn through the water. At 0905 a new fix puts you 075°T, 1.2 nm from Heron Point Light.

   Plot the 0905 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