Worksheet 202 · Skill 5

Set and drift

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1. At 1115 your fix is 306°T, 3.2 nm from Tern Island tower. You steer 169°T at 6.0 kn through the water. At 1200 a new fix puts you 359°T, 3.3 nm from Mill stack.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1530 your fix is 356°T, 2.9 nm from Mill stack. You steer 094°T at 6.9 kn through the water. At 1605 a new fix puts you 176°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1605 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 0950 your fix is 164°T, 1.4 nm from Tern Island tower. You steer 149°T at 6.2 kn through the water. At 1020 a new fix puts you 216°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1020 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 1140 your fix is 230°T, 2.4 nm from Tern Island tower. You steer 283°T at 6.6 kn through the water. At 1220 a new fix puts you 014°T, 1.7 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1330 your fix is 274°T, 3.3 nm from Tern Island tower. You steer 170°T at 5.5 kn through the water. At 1410 a new fix puts you 351°T, 3.0 nm from Mill stack.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1415 your fix is 038°T, 1.3 nm from Westfield church spire. You steer 119°T at 6.1 kn through the water. At 1515 a new fix puts you 174°T, 1.4 nm from Tern Island tower.

   Plot the 1515 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 1600 your fix is 055°T, 3.2 nm from Heron Point Light. You steer 081°T at 4.5 kn through the water. At 1705 a new fix puts you 244°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 1705 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  

8. At 1225 your fix is 359°T, 2.5 nm from Mill stack. You steer 301°T at 4.3 kn through the water. At 1255 a new fix puts you 064°T, 1.9 nm from Heron Point Light.

   Plot the 1255 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