| CPC F17D 5/06 (2013.01) [B62D 1/28 (2013.01); B62D 6/001 (2013.01); E02F 5/027 (2013.01); E02F 5/102 (2013.01); E02F 5/14 (2013.01); E02F 5/145 (2013.01); E02F 9/205 (2013.01); E02F 9/245 (2013.01); E02F 9/265 (2013.01); G01M 3/40 (2013.01); G05D 1/0212 (2013.01); G05D 1/0259 (2013.01); G05D 1/0265 (2013.01); E02F 5/06 (2013.01); E02F 5/103 (2013.01)] | 15 Claims |

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1. A system comprising:
a mobile machine frame;
an outrigger frame attached to the mobile machine frame;
a first receiver, a second receiver, and a third receiver, each of the first, second and third receivers disposed linearly on the outrigger frame at a known distance from each of the other of the first, second and third receivers, in which the receivers are each configured to detect a signal emanating from an underground utility line;
an orientation sensor disposed on the outrigger frame and configured to transmit an orientation signal indicative of an angle of the outrigger frame relative to level plane; and
a processor configured to determine a position of the underground line using the signal received at each of the first, second and third receivers and the orientation signal.
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