Worksheet 641 · Skill 5

Set and drift

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1. At 0750 your fix is 048°T, 3.5 nm from Westfield church spire. You steer 091°T at 5.1 kn through the water. At 0910 a new fix puts you 057°T, 3.6 nm from Tern Island tower.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0820 your fix is 259°T, 2.7 nm from Gannet Rock daybeacon. You steer 247°T at 6.0 kn through the water. At 0855 a new fix puts you 057°T, 1.3 nm from Heron Point Light.

   Plot the 0855 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 0925 your fix is 200°T, 2.1 nm from Tern Island tower. You steer 245°T at 4.7 kn through the water. At 1005 a new fix puts you 054°T, 2.6 nm from Heron Point Light.

   Plot the 1005 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  

4. At 1210 your fix is 012°T, 2.2 nm from Tern Island tower. You steer 256°T at 4.8 kn through the water. At 1245 a new fix puts you 274°T, 2.5 nm from Tern Island tower.

   Plot the 1245 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 1255 your fix is 312°T, 3.4 nm from Tern Island tower. You steer 199°T at 6.5 kn through the water. At 1350 a new fix puts you 081°T, 1.6 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0955 your fix is 307°T, 1.7 nm from Tern Island tower. You steer 245°T at 5.3 kn through the water. At 1025 a new fix puts you 278°T, 3.8 nm from Tern Island tower.

   Plot the 1025 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 1130 your fix is 250°T, 1.9 nm from Tern Island tower. You steer 189°T at 4.9 kn through the water. At 1210 a new fix puts you 354°T, 1.7 nm from Mill stack.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1235 your fix is 257°T, 2.9 nm from Tern Island tower. You steer 248°T at 4.3 kn through the water. At 1325 a new fix puts you 127°T, 2.0 nm from Westfield church spire.

   Plot the 1325 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