Worksheet 330 · Skill 5

Set and drift

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1. At 0940 your fix is 293°T, 3.6 nm from Tern Island tower. You steer 183°T at 4.4 kn through the water. At 1045 a new fix puts you 347°T, 1.7 nm from Mill stack.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1040 your fix is 037°T, 1.6 nm from Gannet Rock daybeacon. You steer 261°T at 5.3 kn through the water. At 1155 a new fix puts you 057°T, 2.8 nm from Heron Point Light.

   Plot the 1155 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  

3. At 0940 your fix is 352°T, 1.0 nm from Kittle water tank. You steer 276°T at 6.7 kn through the water. At 1015 a new fix puts you 228°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1015 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  

4. At 1255 your fix is 055°T, 2.3 nm from Heron Point Light. You steer 353°T at 4.2 kn through the water. At 1400 a new fix puts you 027°T, 2.9 nm from Westfield church spire.

   Plot the 1400 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  

5. At 0725 your fix is 114°T, 1.2 nm from Gannet Rock daybeacon. You steer 340°T at 4.3 kn through the water. At 0820 a new fix puts you 137°T, 1.4 nm from Tern Island tower.

   Plot the 0820 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  

6. At 0755 your fix is 294°T, 1.7 nm from Tern Island tower. You steer 229°T at 6.8 kn through the water. At 0840 a new fix puts you 126°T, 2.1 nm from Westfield church spire.

   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  

7. At 1010 your fix is 046°T, 1.9 nm from Westfield church spire. You steer 164°T at 5.4 kn through the water. At 1045 a new fix puts you 109°T, 2.4 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0800 your fix is 053°T, 1.5 nm from Kittle water tank. You steer 289°T at 4.2 kn through the water. At 0905 a new fix puts you 199°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 0905 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