Costs

• Autonomous GPS - Nav. Grade: Cheap! (<$100 - $1,000)

• Differential GPS

  • Navigation-grade - 2 units w/radio link - <$5,000
  • Survey-grade - 2 units w/radio link - ~$20,000
  • DGPS satellite - $4,000 - $12,000 + $800 per year

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