Worksheet 271 · Skill 5

Set and drift

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1. At 1105 your fix is 039°T, 2.5 nm from Mill stack. You steer 307°T at 4.4 kn through the water. At 1150 a new fix puts you 224°T, 3.3 nm from Tern Island tower.

   Plot the 1150 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  

2. At 1255 your fix is 187°T, 1.3 nm from Gannet Rock daybeacon. You steer 056°T at 7.7 kn through the water. At 1325 a new fix puts you 053°T, 3.1 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1210 your fix is 206°T, 2.7 nm from Tern Island tower. You steer 054°T at 5.5 kn through the water. At 1240 a new fix puts you 098°T, 2.0 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1105 your fix is 291°T, 4.1 nm from Tern Island tower. You steer 084°T at 7.7 kn through the water. At 1140 a new fix puts you 345°T, 2.4 nm from Tern Island tower.

   Plot the 1140 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 0930 your fix is 200°T, 1.2 nm from Gannet Rock daybeacon. You steer 283°T at 7.6 kn through the water. At 1005 a new fix puts you 351°T, 3.4 nm from Mill stack.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0905 your fix is 218°T, 2.3 nm from Gannet Rock daybeacon. You steer 288°T at 8.5 kn through the water. At 0950 a new fix puts you 139°T, 1.4 nm from Westfield church spire.

   Plot the 0950 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 1510 your fix is 039°T, 1.7 nm from Westfield church spire. You steer 072°T at 5.0 kn through the water. At 1615 a new fix puts you 273°T, 1.2 nm from Tern Island tower.

   Plot the 1615 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  

8. At 0835 your fix is 270°T, 2.9 nm from Tern Island tower. You steer 320°T at 5.4 kn through the water. At 0910 a new fix puts you 038°T, 4.5 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn