Push drill guidance indication apparatus

Claim 1

Push drill guidance apparatus for remotely controlling position and attitude of a push drill within an earth borehole, said push drill carrying a plurality of sensors providing data outputs of gamma count, X, Y and Z axis orientation, pitch and roll of the push drill, such data outputs being conducted to a remote control unit which also includes data indicators and drive means for manually controlling said push drill position and attitude, the apparatus further comprising: multiplexing means at said push drill for generating time sequential, frequency indicative signals for each of said sensors for transmission to the remote control unit; microprocessor means at the remote control unit for receiving and demultiplexing said time sequential signals to compute and provide output and display of the plural sensor data outputs; non-volatile random access memory means addressably coacting with said microprocessor means storing sensor parameter data for each of said sensors; a keep-alive voltage source continually energizing said random access memory means; and means enabled in calibrate mode to activate calibrate program of said microprocessor means whereby the sensor parameters for each sensor in each of a plurality of prescribed push drill attitudes is re-calibrated and the updated sensor parameters are stored in said random access memory means.