NX Control Technical Support - GSSI Geophysical Survey Systems, Inc.

Products
- Concrete
  - Flex NX
    - Flex NX®
      Flex NX®, powered by Nexus™ is the industry’s most powerful and complete concrete scanning system. Use Flex NX™ on its own, or pair an NX wireless satellite antenna to be ready for any jobsite challenge.
  - Flex LT
    - Flex LT®
      Flex LT, powered by Nexus, is GSSI’s newest handheld concrete scanning system. This system is a perfect solution for contractors who need to locate and mark targets with speed and precision, without sacrificing quality or budget.
  - NX25
    - NX25®
      Scan hard to reach areas, walls and ceilings with the NX25 antenna. This antenna is lightweight, compact and perfect for you to scan, mark and go.
  - NX15
    - NX15®
      The NX15 antenna is perfect for any situation where you need a combination of resolution and depth.
  - Flex Product Selector
- Utility
  - Compass NX™
    - Compass NX™
      Compass NX™, powered by Nexus®, combines advanced detection capabilities with a streamlined user experience to help users locate, interpret, and act on subsurface information more efficiently.
  - UtilityScan Pro
    - UtilityScan Pro
      The UtilityScan Pro is a versatile utility locating system based on the SIR 4000, and offers several options for customization.
- Transportation
  - RoadScan
    - RoadScan
      The RoadScan™ 30 system is based on the SIR 30 and provides users with an effective tool for quickly determining pavement layers at high speeds.
  - PaveScan RS
    - PaveScan RS
      Achieve optimal asphalt density with PaveScan RS.
  - PaveScan® MDM
    - PaveScan® MDM
      PaveScan Mix Design Module (MDM) is a powerful new tool for QA/QC labs.
  - PaveScan RDM® 2.0
    - PaveScan RDM® 2.0
      The PaveScan RDM uses the dielectric measurements of new pavement to determine pavement quality and uniformity.
  - BridgeScan
    - BridgeScan
      The BridgeScan™ is a complete, affordable GPR system that is an effective tool for quickly determining the condition of aging bridge decks.
- GS Series
  - 200 HS Antenna
    The 200 HS digital, wireless antenna is ideal for geophysical, geotechnical, and environmental applications that require high reliability under challenging survey conditions.
- SIR Systems
  - SIR 4000
    - SIR 4000
      The SIR® 4000 is GSSI’s first high-performance GPR data acquisition system designed to operate with analog and digital antennas.
  - SIR 30
    - SIR 30
      The SIR® 30 is the next-generation multi-channel GPR control unit. This system can collect up to eight channels of data simultaneously with uncompromised performance.
- Antennas
- Software
  - NX Control
    - NX Control
      From locating utilities and scanning concrete to exploring new applications, the NX Control app gives you the features you want and the flexibility you need.
  - GSSI Fusion
    - GSSI Fusion
      GSSI Fusion is an easy-to-use reporting tool for professional results from the field.
  - Geolitix
    - Geolitix
      Geolitix was designed to simplify and automate nearly every step involved in GPR project workflows.
- Accessories
- Legacy Products
- View All

Not sure which product is right for you? Let us help you decide »

Solutions
- Concrete Inspection
  - Concrete Inspection
    Cutting and coring experts and construction professionals require a reliable, non-destructive solution to assess concrete and concrete structures.
- Utility Locating
  - Utility Solutions
    Utility locators, construction professionals, environmental firms and land surveyors need to know about underground assets prior to digging and trenching efforts.
- Transportation
  - Transportation
    Highway professionals, contractors and engineers use GPR to measure asphalt thickness, compaction, and structural integrity with GPR with accurate real-time data.
- Environmental
  - Environmental
    The key to a comprehensive environmental assessment is the subsurface investigation.
- Geology & Geophysics
  - Geology & Geophysics
    Ground penetrating radar (GPR) offers an accurate, non-destructive solution to mapping the subsurface of the earth.
- Archaeology & Forensics
  - Archaeology & Forensics
    Archaeologists and remote sensing specialists around the world rely on GSSI ground penetrating radar as a key tool for non-invasive site investigation.
- Photo Gallery
- View All

Technical Support

Welcome to the support portal for the NX Control app. This page hosts the latest documentation and GSSI Academy training videos to help you get the most from NX Control.

Make sure to check back regularly – we are always working on something new!

Can’t find what you are looking for, or have specific questions? Get quick and easy access to our Customer Service team during our regular business hours (8:30 AM to 5:00 PM EST).

Helpful Resources

Download user manuals, learn about app updates, and browse training videos.

Resources
Training Videos
Firmware Updates

Resources

NX Control Quick Start Guide

Release Date: 10/15/2026

For all Supported Systems: Compass NX, NX15, NX25

Download
NX Control User Manual

Release Date: 10/15/2026

For all Supported Systems: Compass NX, NX15, NX25

Download

NX Control App: Key Features

NX Control: How to Install a License

Download NX Control

The NX Control app is available on the Apple App Store or Google Play Store.

You’ll need a GSSI product licensed for NX Control to pair with the app.
Compatible systems include Compass NX, NX15 Deep Target System, and NX25 Small Area System.

Please view the full calendar to see all the training classes we offer, read training class details and to sign up for a course. View All Events