Surface Recording Gyro


Welnav offers a complete range of borehole surveying services, including:

  • Magnetic single shot service & rental
  • Magnetic multi-shot service & rental
  • Photo-gyro single shot
  • Photo-gyro multi-shot
  • SRG orienting



  • Ranges : 0-6° to 0-180°
  • Resolution : .01° to 0.04°
  • Accuracy : .03° to 0.05°


  • Resolution : .02°
  • Accuracy : .15° Over Temperature Range
  • High Side Alignment : -.20° Typical
  • Offset Center: Less Than .06° (approx. .02° after software correction)
  • Temperature Range: -55° C to +125° C
  • Temperature Variation: Compensated Over Temperature Range (typically less than .03°)
Accurately Locate Your ORE BODY

WELNAV SRG (Surface Recording Gyroscope) van provides gyro-survey's which are the fastest, most accurate means of locating the exact location of your drill hole from collar to TD.

  • Faster, less rig time is required per survey.
  • More Accurate: you receive a computer digital reading which is translated to a printed computerized report.
  • Cost Effective: savings are realized by eliminating costly mining mistakes.

WELNAV offers a complete range of services, including:

  • Magnetic single shot rental.
  • Magnetic multishot service.
  • Gyro single shot service.
  • Gyro multishot service.
  • Surface Recording Gyro orienting service.
  • Surface Recording Gyro multishot service.

Our MSRG (multishot recording gyroscope) photographic instrument is portable enough to provide drill hole surveys anywhere in the world.

For the nearest personnel and equipment depot contact:


15032 Redhill Avenue Suite D
Tustin, CA 92780
Voice: 714/259-7760
FAX 714/259-9257


ELKO, NEVADAVoice: (775) 753-7723Fax: (775) 753-7432
WINNEMUCCA, NEVADAVoice: (775) 623-8773Fax: (775) 623-3307
HOUSTON, TEXASVoice: (713) 849-3498Fax: (713) 849-3643
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