Worksheet 214 · Skill 5

Set and drift

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1. At 1005 your fix is 080°T, 2.1 nm from Westfield church spire. You steer 172°T at 4.0 kn through the water. At 1035 a new fix puts you 029°T, 2.1 nm from Heron Point Light.

   Plot the 1035 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  

2. At 1335 your fix is 096°T, 2.6 nm from Gannet Rock daybeacon. You steer 330°T at 5.3 kn through the water. At 1430 a new fix puts you 080°T, 3.5 nm from Tern Island tower.

   Plot the 1430 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  

3. At 0945 your fix is 009°T, 1.7 nm from Kittle water tank. You steer 337°T at 8.0 kn through the water. At 1015 a new fix puts you 012°T, 1.6 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1310 your fix is 347°T, 1.9 nm from Mill stack. You steer 000°T at 7.1 kn through the water. At 1405 a new fix puts you 301°T, 4.2 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0955 your fix is 048°T, 1.5 nm from Gannet Rock daybeacon. You steer 254°T at 6.4 kn through the water. At 1030 a new fix puts you 208°T, 2.9 nm from Tern Island tower.

   Plot the 1030 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 0940 your fix is 029°T, 2.5 nm from Heron Point Light. You steer 124°T at 8.7 kn through the water. At 1010 a new fix puts you 053°T, 2.0 nm from Mill stack.

   Plot the 1010 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  

7. At 1555 your fix is 065°T, 1.5 nm from Heron Point Light. You steer 068°T at 7.7 kn through the water. At 1630 a new fix puts you 205°T, 1.3 nm from Tern Island tower.

   Plot the 1630 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 0900 your fix is 018°T, 2.5 nm from Heron Point Light. You steer 323°T at 4.9 kn through the water. At 0945 a new fix puts you 060°T, 1.8 nm from Westfield church spire.

   Plot the 0945 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