Worksheet 307 · Skill 5

Set and drift

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1. At 0830 your fix is 039°T, 2.9 nm from Heron Point Light. You steer 304°T at 4.3 kn through the water. At 0915 a new fix puts you 032°T, 1.4 nm from Westfield church spire.

   Plot the 0915 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 1205 your fix is 142°T, 1.6 nm from Gannet Rock daybeacon. You steer 249°T at 4.1 kn through the water. At 1250 a new fix puts you 035°T, 2.3 nm from Mill stack.

   Plot the 1250 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  

3. At 0840 your fix is 145°T, 1.5 nm from Tern Island tower. You steer 246°T at 7.6 kn through the water. At 0920 a new fix puts you 076°T, 2.2 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1045 your fix is 069°T, 3.7 nm from Tern Island tower. You steer 266°T at 6.3 kn through the water. At 1120 a new fix puts you 010°T, 1.1 nm from Tern Island tower.

   Plot the 1120 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  

5. At 1400 your fix is 305°T, 1.4 nm from Gannet Rock daybeacon. You steer 268°T at 7.6 kn through the water. At 1450 a new fix puts you 014°T, 2.2 nm from Heron Point Light.

   Plot the 1450 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  

6. At 1245 your fix is 000°T, 1.9 nm from Gannet Rock daybeacon. You steer 232°T at 5.9 kn through the water. At 1320 a new fix puts you 267°T, 2.0 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1200 your fix is 067°T, 2.3 nm from Westfield church spire. You steer 174°T at 4.3 kn through the water. At 1250 a new fix puts you 064°T, 1.0 nm from Heron Point Light.

   Plot the 1250 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  

8. At 0750 your fix is 024°T, 3.6 nm from Westfield church spire. You steer 124°T at 4.8 kn through the water. At 0840 a new fix puts you 230°T, 3.1 nm from Tern Island tower.

   Plot the 0840 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