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Very briefly, the GSDM:

• is easy to use because it is based upon rules of solid geometry.
  
  
• is standard between disciplines and can be used the world
  over. Polar regions need special treatment for convergence.
  
  
• accommodates modern measurement systems and digital data
  storage technologies.
  
  
• supports both analog map plots and computer visualization
  of digital spatial data.
  
  
• preserves geometrical integrity and does not distort physical
  measurements as do map projections.
  
  
• combines horizontal and vertical data into a single 3-D
  data base.
  
  
• facilitates rigorous error propagation and standard deviation
  computations, component by component.
  
  
• provides specific mathematical definitions of datum accuracy,
  local accuracy, network accuracy, and P.O.B. accuracy.

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