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PRISMATIC COMPASS

  • The graduated ring remains stationary as it is attached to magnetic needle. While the compass needle and the eye sight vane can be rotated
  • The graduations are made in such a way that 00 or 3600 is at the south, 1800 at north, 900 at south and 2700 at east
  • Sighting of the object and the taking of reading is done simultaneously
  • Prismatic compass can be used without a tripod

SURVEYORS COMPASS

  • The graduated ring being attached to the compass moves with sights. But needle remains stationary when box is rotated
  • The graduations are made as 00 at north & south 900 at east and west. The east and west positions are interchanged in order to read the bearing in quadrantal bearing system
  • Sighting the object is done first. Then the reading is to be taken with naked eye by looking above the needle point
  • Surveyor's compass cannot be used without a tripod
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Wiki User

14y ago
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13y ago

Whole circle bearing, quadrantal bearing

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Q: What is the difference between surveyors compass and prismatic compass?
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