Worksheet 407 · Skill 5

Set and drift

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1. At 1120 your fix is 033°T, 3.1 nm from Heron Point Light. You steer 011°T at 7.7 kn through the water. At 1155 a new fix puts you 303°T, 3.5 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0835 your fix is 272°T, 1.6 nm from Gannet Rock daybeacon. You steer 061°T at 6.8 kn through the water. At 0910 a new fix puts you 024°T, 2.4 nm from Gannet Rock daybeacon.

   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  

3. At 0835 your fix is 227°T, 2.4 nm from Tern Island tower. You steer 294°T at 5.4 kn through the water. At 0905 a new fix puts you 090°T, 2.4 nm from Westfield church spire.

   Plot the 0905 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 1055 your fix is 034°T, 4.0 nm from Westfield church spire. You steer 233°T at 5.3 kn through the water. At 1125 a new fix puts you 027°T, 0.9 nm from Westfield church spire.

   Plot the 1125 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  

5. At 0945 your fix is 117°T, 1.6 nm from Tern Island tower. You steer 194°T at 4.2 kn through the water. At 1015 a new fix puts you 255°T, 1.9 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  

6. At 1255 your fix is 036°T, 1.7 nm from Kittle water tank. You steer 350°T at 4.6 kn through the water. At 1335 a new fix puts you 053°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 1335 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  

7. At 1305 your fix is 315°T, 2.8 nm from Tern Island tower. You steer 215°T at 5.6 kn through the water. At 1355 a new fix puts you 355°T, 1.7 nm from Heron Point Light.

   Plot the 1355 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  

8. At 1600 your fix is 031°T, 1.6 nm from Kittle water tank. You steer 292°T at 5.7 kn through the water. At 1710 a new fix puts you 212°T, 2.4 nm from Tern Island tower.

   Plot the 1710 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn