Worksheet 667 · Skill 5

Set and drift

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1. At 1530 your fix is 351°T, 1.7 nm from Tern Island tower. You steer 245°T at 4.0 kn through the water. At 1610 a new fix puts you 071°T, 3.6 nm from Westfield church spire.

   Plot the 1610 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 1130 your fix is 267°T, 2.5 nm from Tern Island tower. You steer 128°T at 4.6 kn through the water. At 1300 a new fix puts you 060°T, 2.1 nm from Mill stack.

   Plot the 1300 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1240 your fix is 325°T, 2.5 nm from Tern Island tower. You steer 197°T at 6.2 kn through the water. At 1330 a new fix puts you 229°T, 3.3 nm from Tern Island tower.

   Plot the 1330 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  

4. At 1310 your fix is 265°T, 3.0 nm from Tern Island tower. You steer 232°T at 4.8 kn through the water. At 1355 a new fix puts you 172°T, 1.1 nm from Westfield church spire.

   Plot the 1355 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 0720 your fix is 247°T, 2.2 nm from Tern Island tower. You steer 271°T at 5.0 kn through the water. At 0755 a new fix puts you 091°T, 3.4 nm from Westfield church spire.

   Plot the 0755 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 0705 your fix is 324°T, 2.9 nm from Kittle water tank. You steer 276°T at 7.0 kn through the water. At 0740 a new fix puts you 065°T, 2.3 nm from Heron Point Light.

   Plot the 0740 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 1220 your fix is 085°T, 3.5 nm from Westfield church spire. You steer 102°T at 9.0 kn through the water. At 1255 a new fix puts you 155°T, 3.1 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1315 your fix is 207°T, 3.1 nm from Tern Island tower. You steer 188°T at 4.0 kn through the water. At 1350 a new fix puts you 052°T, 1.6 nm from Mill stack.

   Plot the 1350 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