Worksheet 261 · Skill 5

Set and drift

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1. At 1200 your fix is 035°T, 2.5 nm from Heron Point Light. You steer 244°T at 4.8 kn through the water. At 1230 a new fix puts you 359°T, 1.0 nm from Heron Point Light.

   Plot the 1230 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  

2. At 1210 your fix is 288°T, 3.2 nm from Tern Island tower. You steer 212°T at 5.0 kn through the water. At 1300 a new fix puts you 035°T, 2.3 nm from Heron Point Light.

   Plot the 1300 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  

3. At 1000 your fix is 255°T, 3.5 nm from Tern Island tower. You steer 044°T at 5.8 kn through the water. At 1035 a new fix puts you 319°T, 2.2 nm from Tern Island tower.

   Plot the 1035 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  

4. At 0820 your fix is 083°T, 2.2 nm from Heron Point Light. You steer 021°T at 4.1 kn through the water. At 0920 a new fix puts you 219°T, 1.9 nm from Tern Island tower.

   Plot the 0920 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0920 your fix is 036°T, 3.5 nm from Gannet Rock daybeacon. You steer 288°T at 4.0 kn through the water. At 1050 a new fix puts you 303°T, 4.2 nm from Tern Island tower.

   Plot the 1050 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1435 your fix is 084°T, 3.2 nm from Westfield church spire. You steer 198°T at 5.5 kn through the water. At 1510 a new fix puts you 348°T, 0.9 nm from Heron Point Light.

   Plot the 1510 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  

7. At 1205 your fix is 251°T, 3.1 nm from Tern Island tower. You steer 181°T at 4.2 kn through the water. At 1245 a new fix puts you 085°T, 2.2 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1155 your fix is 114°T, 1.7 nm from Tern Island tower. You steer 236°T at 5.5 kn through the water. At 1235 a new fix puts you 055°T, 2.8 nm from Heron Point Light.

   Plot the 1235 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