Worksheet 580 · Skill 5

Set and drift

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1. At 0810 your fix is 331°T, 1.8 nm from Mill stack. You steer 036°T at 4.7 kn through the water. At 0900 a new fix puts you 222°T, 3.3 nm from Tern Island tower.

   Plot the 0900 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0925 your fix is 012°T, 3.0 nm from Westfield church spire. You steer 175°T at 6.9 kn through the water. At 0955 a new fix puts you 130°T, 1.4 nm from Westfield church spire.

   Plot the 0955 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 1410 your fix is 063°T, 3.1 nm from Heron Point Light. You steer 065°T at 5.3 kn through the water. At 1525 a new fix puts you 054°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 1525 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  

4. At 1425 your fix is 050°T, 1.4 nm from Tern Island tower. You steer 122°T at 5.4 kn through the water. At 1510 a new fix puts you 072°T, 2.2 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1245 your fix is 052°T, 3.3 nm from Heron Point Light. You steer 174°T at 4.1 kn through the water. At 1320 a new fix puts you 339°T, 1.9 nm from Mill stack.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1145 your fix is 066°T, 3.9 nm from Tern Island tower. You steer 188°T at 5.2 kn through the water. At 1215 a new fix puts you 058°T, 2.8 nm from Gannet Rock daybeacon.

   Plot the 1215 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  

7. At 1145 your fix is 332°T, 2.4 nm from Tern Island tower. You steer 251°T at 6.4 kn through the water. At 1220 a new fix puts you 062°T, 3.5 nm from Westfield church spire.

   Plot the 1220 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 1045 your fix is 253°T, 3.6 nm from Tern Island tower. You steer 138°T at 7.9 kn through the water. At 1125 a new fix puts you 206°T, 1.8 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn