Worksheet 109 · Skill 5

Set and drift

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1. At 1240 your fix is 260°T, 3.1 nm from Tern Island tower. You steer 193°T at 4.4 kn through the water. At 1320 a new fix puts you 073°T, 2.4 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0935 your fix is 045°T, 2.3 nm from Tern Island tower. You steer 269°T at 4.9 kn through the water. At 1040 a new fix puts you 278°T, 3.8 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  

3. At 1310 your fix is 297°T, 4.5 nm from Tern Island tower. You steer 151°T at 7.2 kn through the water. At 1415 a new fix puts you 015°T, 2.3 nm from Mill stack.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0755 your fix is 072°T, 4.9 nm from Tern Island tower. You steer 271°T at 6.4 kn through the water. At 0840 a new fix puts you 341°T, 2.5 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1240 your fix is 117°T, 1.6 nm from Tern Island tower. You steer 238°T at 6.7 kn through the water. At 1325 a new fix puts you 060°T, 1.3 nm from Heron Point Light.

   Plot the 1325 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  

6. At 0725 your fix is 290°T, 4.0 nm from Tern Island tower. You steer 188°T at 4.5 kn through the water. At 0835 a new fix puts you 336°T, 1.1 nm from Heron Point Light.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1555 your fix is 022°T, 3.3 nm from Westfield church spire. You steer 136°T at 8.3 kn through the water. At 1635 a new fix puts you 219°T, 2.6 nm from Tern Island tower.

   Plot the 1635 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  

8. At 0825 your fix is 198°T, 2.6 nm from Tern Island tower. You steer 286°T at 5.1 kn through the water. At 0930 a new fix puts you 023°T, 0.9 nm from Westfield church spire.

   Plot the 0930 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