Worksheet 212 · Skill 5

Set and drift

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1. At 0750 your fix is 037°T, 2.3 nm from Westfield church spire. You steer 101°T at 5.2 kn through the water. At 0835 a new fix puts you 282°T, 1.9 nm from Tern Island tower.

   Plot the 0835 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 0810 your fix is 298°T, 2.8 nm from Tern Island tower. You steer 157°T at 5.2 kn through the water. At 0910 a new fix puts you 357°T, 2.7 nm from Mill stack.

   Plot the 0910 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  

3. At 0935 your fix is 028°T, 4.1 nm from Westfield church spire. You steer 108°T at 4.2 kn through the water. At 1040 a new fix puts you 268°T, 2.6 nm from Tern Island tower.

   Plot the 1040 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  

4. At 1245 your fix is 057°T, 3.1 nm from Heron Point Light. You steer 107°T at 6.3 kn through the water. At 1320 a new fix puts you 202°T, 2.4 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  

5. At 1600 your fix is 023°T, 2.3 nm from Mill stack. You steer 312°T at 5.3 kn through the water. At 1700 a new fix puts you 278°T, 2.8 nm from Tern Island tower.

   Plot the 1700 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  

6. At 1510 your fix is 043°T, 2.2 nm from Tern Island tower. You steer 259°T at 8.4 kn through the water. At 1555 a new fix puts you 069°T, 3.5 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0950 your fix is 063°T, 3.8 nm from Westfield church spire. You steer 171°T at 8.7 kn through the water. At 1025 a new fix puts you 326°T, 1.0 nm from Mill stack.

   Plot the 1025 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 1110 your fix is 282°T, 2.1 nm from Tern Island tower. You steer 297°T at 4.4 kn through the water. At 1205 a new fix puts you 039°T, 3.6 nm from Westfield church spire.

   Plot the 1205 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