Bad Elf Flex 4+

Utility for Flex GNSS receiver

Bad Elf, LLC.

    • 4.4 • 5 Ratings
    • Free



This is the free companion utility app for the Bad Elf Flex, a flexible, intuitive, and affordable survey-grade GNSS receiver.

Designed for GIS and survey professionals, the Bad Elf Flex connects to your iPhone or iPad via Bluetooth and provides high-accuracy location data to ANY and ALL field data collection apps in your workflow.

This app allows you to view the health of the Flex hardware, change settings, and perform firmware updates. The app also supports purchasing and loading Flex Tokens into the hardware for enabling hardware-based features and correction sources. Several correction sources are supported including SBAS, RTK via NTRIP, and Atlas (L-band) satellite corrections.

Visit to learn more about the Bad Elf Flex and our other GNSS receivers.


* This app requires a Bad Elf Flex to operate.

* Please ensure your Flex is running the latest firmware available:

* Our "Bad Elf GPS" companion app supports our mapping-grade receivers: Bad Elf GPS Pro, GPS Pro+, Surveyor, and GPS for Lightning dongle.

* Continued use of the GPS running in the background can dramatically decrease battery life.

What’s New

Version 1.1.0

This major app update introduces base/rover support, allowing geospatial professionals to achieve survey-grade accuracy anywhere in the world -- no cellular connectivity required.

Updates included in this release:

* added base/rover support ( learn more at )
* added checklists for all correction modes
* added UHF radio support, connected via USB or Bluetooth
* added stored locations usable for navigation and configuring a base station
* updated NTRIP client for RTCM corrections via raw TCP
* improved UI colors used when running in dark mode

Ratings and Reviews

4.4 out of 5
5 Ratings

5 Ratings

jazzwndsrf ,


The Flex is giving us sub-inch horizontal accuracies even with a moderately dense tree canopy and using the integrated antenna. Using with ArcGIS Collector and Spyglass.

App Privacy

The developer, Bad Elf, LLC., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Linked to You

The following data may be collected and linked to your identity:

  • Identifiers
  • Usage Data

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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