DeviGyro Overshot Xpress

Compact overshot surveying solution


The DeviGyro Overshot Xpress (the OX) is a purpose-built overshot survey solution for the diamond core drilling application. Enabling continuous gyro surveying up to 100m/min whilst retrieving the core tube, minimizing the impact on drilling productivity. The compact 1.2m design improves operator handling, making it a safer option compared to conventional overshot survey systems. Precise, quick, and strong as an ox, the DeviGyro Overshot Xpress is the drillers choice for maximizing bit-on-face time while controlling deviation.

1230 mm / 48.4 in
10.5 kg
23.1 lbs
Azimuth accuracy:
Typical positional accuracy:
Inclination accuracy:
Toolface accuracy:
*Calibrated for temperature range -10C to +60C
Pressure (bar/psi)
Temperature range
-20° to +60°C/-4° to 140°F
Compatible sizes
Azimuth accuracy
Typical positional accuracy
Inclination accuracy
Tool face accuracy
Azimuth range
Inclination range
-90°− +90°
Survey modes
Continuous or multishot
Survey speed, up to
100 m/min
Effected by magnetics
6h 40min
Data communication
Battery type
1x CR 123a
Battery capacity, continuous use
24 hours
*Calibrated for temperature range -10C to +60C

Handheld device

Android Smartphone
DeviGyro App
Battery capacity, continuous use
15 hours
Battery type
IP rating

As with all DeviGyro based survey solutions, quick, comprehensive, high precision, continuous surveying is made possible with the DeviGyro Overshot Xpress (OX). With the added ability to retrieve the core tube during the survey, the OX truly enables surveying to become a part of the drilling cycle and therefore increasing overall drilling productivity.

In combination with the DeviCounter, the OX performs continuous surveys at speeds of up to 100 m/min. Survey data is recorded at a sample rate of 10 shots per second, both while the instrument is lowered down the drill string to attach to the core tube, and while in the process of retrieving the core tube to the collar. Effectively completing 2 independent survey runs as per the Devico standard, to provide additional quality control.

At the completion of each survey all data is passed through an automatic, stringent, at-rig QA/QC process with a comprehensive pass/fail criteria, quickly providing the operator with full awareness of the survey results, and drill hole position. Equipped for the next step in the drilling process.

Though the OX is the ideal borehole surveying solution for both surface and underground diamond core drilling applications, its short 1.2m length eases overall handling and therefore makes it especially beneficial for surveying underground and in other confined space environments.

DeviGyro Overshot Xpress, your choice for minimizing the impact that surveying has on drilling productivity and maximizing bit-on-face time.


  • Quick set up time
  • No impact on drilling
  • 100 m/min survey speed
  • Precise repeatability at all angles
  • Simple to use intuitive operating software
  • True wireless - Connects when fully assembled
  • Scandinavian made - Robust and reliable
  • Immediate, stringent QA check
  • Commercially available battery
  • Not affected by magnetics
  • DeviCloud compatible
  • V-wall compatible

Application areas

  • Diamond Core Drilling
  • Continuous surveying
  • Single & Multi-shot surveying
  • Wireline or pump down

Sarah Byrnes-Coulombe, from SurveyTECH Instruments & Services about the OX

Sarah Byrnes-Coulombe, from SurveyTECH Instruments & Services about the OX
The DeviGyro OX has proven that overshot surveying does not need to 'weigh' down the drilling process, both literally and figuratively. Driller-operated overshot surveying with the OX has taken the industry by storm, giving the drillers the power to save time and achieve higher-quality data while doing so.
Sarah Byrnes-Coulombe
Area Manager
SurveyTECH Instruments & Services
product brochure

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Frequently asked questions about DeviGyro OVERSHOT XPRESS

What downhole survey tools do Devico have that are compatible with V-wall rods?

The DeviGyro RG40, DeviGyro Overshot Xpress and DeviShot products are available with V-wall compatible centralization.

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What downhole survey tools do Devico offer for diamond core drilling?

DeviGyro RG40, DeviGyro Overshot Xpress, DeviFlex RAPID and DeviShot.

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What is the contingency plan for a stuck tube?

The shear pin we use in the OX assembly is designed to break under a specific amount of pressure (approx. shear strength 17,5 kN). Preventing the risk of having to cut the wireline and leave the tool down the hole if the tube is stuck. Only the latch unit of the OX will remain in the hole when this pin breaks. The survey can still be completed also.

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Can you run a survey without retrieving the core tube?

Yes. Though for this process we recommend using the spear cap (provided in OX kit) or removing the overshot latch unit prior to doing so, to mitigate the risk of accidentally latching to the tube.

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How long does it take to survey a 100m drill hole with the DeviGyro Overshot Xpress (OX)?

Assuming a moderate average survey speed of approx. 60m/min, a 100m survey takes about 4 minutes. A key point here is that by running the OX when retrieving core, surveying becomes part of the drilling cycle and therefore survey time does not interrupt drilling productivity.

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