GPS

GPS units utilise "Global Positioning Satellites to measure distances, some use ground mapping where the course is walked and checked and maps that are created from air bourn images such as google earth

 
 
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Full featured with maps

The top end product feature full maps of holes with graphics and many details

 
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Front Middle back

These units provide basic data, the distance to 

  • The front of the green
  • The middle of the green
  • The back of the green
 
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Full featured watches

There are some great watches that provide all data