Worksheet 493 · Skill 5

Set and drift

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1. At 1320 your fix is 042°T, 3.3 nm from Westfield church spire. You steer 090°T at 9.0 kn through the water. At 1415 a new fix puts you 072°T, 4.0 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1335 your fix is 256°T, 3.4 nm from Tern Island tower. You steer 349°T at 6.5 kn through the water. At 1405 a new fix puts you 293°T, 3.9 nm from Tern Island tower.

   Plot the 1405 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 1130 your fix is 351°T, 3.5 nm from Mill stack. You steer 303°T at 7.7 kn through the water. At 1200 a new fix puts you 056°T, 2.2 nm from Westfield church spire.

   Plot the 1200 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  

4. At 0855 your fix is 339°T, 2.4 nm from Tern Island tower. You steer 240°T at 6.9 kn through the water. At 0935 a new fix puts you 068°T, 3.5 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1210 your fix is 082°T, 2.8 nm from Westfield church spire. You steer 041°T at 4.3 kn through the water. At 1245 a new fix puts you 060°T, 3.9 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1355 your fix is 071°T, 4.7 nm from Tern Island tower. You steer 234°T at 5.3 kn through the water. At 1510 a new fix puts you 014°T, 1.9 nm from Mill stack.

   Plot the 1510 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  

7. At 1510 your fix is 040°T, 1.4 nm from Heron Point Light. You steer 097°T at 6.1 kn through the water. At 1610 a new fix puts you 253°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 1610 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 1515 your fix is 257°T, 1.0 nm from Gannet Rock daybeacon. You steer 269°T at 7.1 kn through the water. At 1555 a new fix puts you 038°T, 1.7 nm from Heron Point Light.

   Plot the 1555 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