Patent ID: 8140259

Claim:
A location device embedded within a drill bit, the location device, comprising: a gravity measurement instrument, said gravity measurement instrument being configured to measure a gravitation field at a location of said device and to generate a gravitation signal that is reflective of said gravitation field; a timepiece indicating a time at said location during which said gravity measurement instrument measures said gravitation field and configured to generate a time signal reflective of said time; a database that includes location data as a function of time for a first astronomical object relative to a second astronomical object, said database configured to be in communication with said gravity measurement instrument and said timepiece, said database receiving said time signal and said gravitation signal and configured to calculate: a first vector direction dependent upon said gravitation signal and said time signal; a second vector direction dependent upon said gravitation signal and said time signal; and position data indicating said location of said device, said position data dependent upon said first vector direction, said second vector direction, said time signal, and said location data as a function of time.