General Questions

Questions about geographic coordinate systems

• What is UPS?
• Is the WGS84 datum more accurate than NAD27?
• What are the distances represented by a minute of latitude and longitude?
• How do I calculate the distance between two points?
• Is the UTM system based on True North or Magnetic North?
• Is UTM is another name for MGRS?
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Questions about GPS selection, setup and use

• What kind of accuracy can I expect from my GPS?
• My GPS readings are consistently in the wrong position. What am I doing wrong?
• Which lat/lon format should I use?
• What is the User UTM Grid setting used for?
• Do I use UTM/UPS or User UTM Grid?
• How do I set my GPS receiver to use UTM?
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