Worksheet 301 · Skill 5

Set and drift

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1. At 0935 your fix is 054°T, 4.1 nm from Tern Island tower. You steer 265°T at 7.9 kn through the water. At 1055 a new fix puts you 058°T, 1.6 nm from Westfield church spire.

   Plot the 1055 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1150 your fix is 048°T, 2.0 nm from Kittle water tank. You steer 279°T at 4.4 kn through the water. At 1310 a new fix puts you 076°T, 1.8 nm from Heron Point Light.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1505 your fix is 271°T, 0.9 nm from Gannet Rock daybeacon. You steer 291°T at 5.2 kn through the water. At 1610 a new fix puts you 039°T, 2.9 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1030 your fix is 071°T, 3.4 nm from Westfield church spire. You steer 184°T at 5.5 kn through the water. At 1115 a new fix puts you 309°T, 2.0 nm from Mill stack.

   Plot the 1115 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 0805 your fix is 344°T, 2.3 nm from Mill stack. You steer 296°T at 4.0 kn through the water. At 0910 a new fix puts you 027°T, 3.5 nm from Heron Point Light.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0905 your fix is 069°T, 1.9 nm from Westfield church spire. You steer 143°T at 4.1 kn through the water. At 0955 a new fix puts you 046°T, 2.8 nm from Heron Point Light.

   Plot the 0955 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  

7. At 0830 your fix is 209°T, 2.8 nm from Tern Island tower. You steer 355°T at 4.5 kn through the water. At 0915 a new fix puts you 281°T, 3.0 nm from Tern Island tower.

   Plot the 0915 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  

8. At 1245 your fix is 035°T, 2.6 nm from Westfield church spire. You steer 093°T at 5.1 kn through the water. At 1320 a new fix puts you 276°T, 3.0 nm from Tern Island tower.

   Plot the 1320 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