Worksheet 161 · Skill 5

Set and drift

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1. At 0825 your fix is 032°T, 2.8 nm from Kittle water tank. You steer 254°T at 9.0 kn through the water. At 0910 a new fix puts you 351°T, 2.4 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0720 your fix is 069°T, 4.4 nm from Tern Island tower. You steer 194°T at 7.2 kn through the water. At 0750 a new fix puts you 025°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 0750 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  

3. At 1245 your fix is 358°T, 1.9 nm from Westfield church spire. You steer 136°T at 6.1 kn through the water. At 1350 a new fix puts you 062°T, 1.8 nm from Heron Point Light.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1335 your fix is 271°T, 3.7 nm from Tern Island tower. You steer 164°T at 6.7 kn through the water. At 1405 a new fix puts you 224°T, 3.2 nm from Tern Island tower.

   Plot the 1405 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  

5. At 1000 your fix is 282°T, 1.0 nm from Gannet Rock daybeacon. You steer 253°T at 7.1 kn through the water. At 1045 a new fix puts you 009°T, 1.1 nm from Heron Point Light.

   Plot the 1045 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 1430 your fix is 164°T, 1.5 nm from Tern Island tower. You steer 251°T at 7.2 kn through the water. At 1505 a new fix puts you 083°T, 2.2 nm from Heron Point Light.

   Plot the 1505 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 1240 your fix is 005°T, 1.6 nm from Mill stack. You steer 315°T at 4.9 kn through the water. At 1335 a new fix puts you 236°T, 3.2 nm from Tern Island tower.

   Plot the 1335 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  

8. At 1120 your fix is 194°T, 1.5 nm from Gannet Rock daybeacon. You steer 040°T at 4.4 kn through the water. At 1235 a new fix puts you 048°T, 3.2 nm from Gannet Rock daybeacon.

   Plot the 1235 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn