Worksheet 121 · Skill 5

Set and drift

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1. At 0735 your fix is 165°T, 0.9 nm from Gannet Rock daybeacon. You steer 299°T at 6.0 kn through the water. At 0810 a new fix puts you 223°T, 3.0 nm from Tern Island tower.

   Plot the 0810 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  

2. At 0910 your fix is 048°T, 2.3 nm from Westfield church spire. You steer 170°T at 6.5 kn through the water. At 0945 a new fix puts you 335°T, 0.9 nm from Heron Point Light.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1310 your fix is 062°T, 2.5 nm from Heron Point Light. You steer 079°T at 4.4 kn through the water. At 1400 a new fix puts you 342°T, 2.7 nm from Kittle water tank.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1235 your fix is 082°T, 2.7 nm from Westfield church spire. You steer 046°T at 4.5 kn through the water. At 1310 a new fix puts you 267°T, 3.2 nm from Tern Island tower.

   Plot the 1310 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  

5. At 1200 your fix is 195°T, 1.7 nm from Tern Island tower. You steer 166°T at 5.1 kn through the water. At 1240 a new fix puts you 029°T, 1.3 nm from Mill stack.

   Plot the 1240 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  

6. At 1125 your fix is 335°T, 1.9 nm from Mill stack. You steer 319°T at 6.6 kn through the water. At 1210 a new fix puts you 071°T, 2.8 nm from Westfield church spire.

   Plot the 1210 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 1400 your fix is 291°T, 4.1 nm from Tern Island tower. You steer 135°T at 4.9 kn through the water. At 1515 a new fix puts you 321°T, 1.7 nm from Kittle water tank.

   Plot the 1515 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  

8. At 1100 your fix is 247°T, 2.6 nm from Gannet Rock daybeacon. You steer 335°T at 7.1 kn through the water. At 1155 a new fix puts you 276°T, 3.4 nm from Tern Island tower.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn