Worksheet 939 · Skill 5

Set and drift

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1. At 1240 your fix is 264°T, 2.4 nm from Tern Island tower. You steer 142°T at 7.9 kn through the water. At 1320 a new fix puts you 230°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1320 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  

2. At 1030 your fix is 134°T, 1.7 nm from Westfield church spire. You steer 088°T at 6.1 kn through the water. At 1100 a new fix puts you 058°T, 2.7 nm from Heron Point Light.

   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  

3. At 0845 your fix is 061°T, 2.9 nm from Heron Point Light. You steer 349°T at 5.9 kn through the water. At 0920 a new fix puts you 061°T, 3.1 nm from Westfield church spire.

   Plot the 0920 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  

4. At 1335 your fix is 305°T, 3.7 nm from Tern Island tower. You steer 213°T at 4.3 kn through the water. At 1415 a new fix puts you 062°T, 2.7 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1315 your fix is 005°T, 3.0 nm from Mill stack. You steer 325°T at 5.0 kn through the water. At 1430 a new fix puts you 044°T, 4.0 nm from Westfield church spire.

   Plot the 1430 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  

6. At 0925 your fix is 068°T, 3.0 nm from Westfield church spire. You steer 071°T at 4.7 kn through the water. At 1000 a new fix puts you 276°T, 2.6 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  

7. At 0820 your fix is 221°T, 2.8 nm from Tern Island tower. You steer 085°T at 5.0 kn through the water. At 0920 a new fix puts you 039°T, 2.9 nm from Gannet Rock daybeacon.

   Plot the 0920 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  

8. At 1235 your fix is 278°T, 2.1 nm from Tern Island tower. You steer 145°T at 7.2 kn through the water. At 1310 a new fix puts you 279°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 1310 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