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Controlling an underground object

  • US 7,212,131 B2
  • Filed: 09/23/2005
  • Issued: 05/01/2007
  • Est. Priority Date: 02/22/1999
  • Status: Expired due to Term
First Claim
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1. A method of operating an underground or inaccessible object, said object including a sonde arranged to emit signals having a plurality of non-orientation-dependent characteristics, said method comprising the steps of:

  • applying a predetermined rotation sequence involving at least one rotation step to said object;

    detecting, said rotation sequence;

    wherein said detection of said rotation sequence causes said sonde to change from the emission of a hint signal having a first non-orientation-dependent characteristic to the emission of a second signal having a second nonorientation-dependent characteristic.

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