Bad Elf Flex

The Future of GNSS for GIS, mapping, and survey

The Bad Elf Flex Story

Bad Elf Flex represents the democtratization of GNSS and defines the future of field data collection. Our customers have shared the need for a cost-reduced GNSS solution with a full RTK rover workflow. Flex delivers this solution with an introductory base price of USD $2499.99*.

Need higher accuracy, no problem. Bad Elf Flex tokens provide a $25* US per day rate for reatures that typically cost thousands of dollars. The daily rate includes full access to both an unlocked RTK workflow and the Atlas L-Band correction service. Flex provides the first receiver having a daily choice with no limitation switching between L-Band and RTK.

Companies that use Bad Elf Flex as a total geospatial solution have a new advantage. A single GNSS receiver removes the need to bring multiple devices into the field. Surveyors and their crews have a scalable survey-grade receiver. GIS managers can focus on flexible field choices for work crews with varying skill levels. Businesses have the operational and financial efficiency they seek. Bad Elf Flex fulfills all these needs in one product.


correct in all details; exact.
  • 2 cm RTK via NTRIP
  • 5 cm to 10 cmvia satellite corrections worldwide
  • 30 cm - 60 cm via SBAS
  • 1 m autonomous
  • Post-processing capable
  • Multii-frequency / multi-constellation - BeiDou, Galilelo, GPS, and Glonass


really, truly, disruptively affordable.
  • Introductory pricing at USD $2,499*
  • Extreme option starting at USD $4,999*
  • Daily Flex Tokens available for USD $25* for a 24 hour period


able to adapt or be adapted to many different functions or activities..
  • Portable, self-contained - mount on a rover pole or hold in one hand
  • Functional, full-day operation - 12hr battery life2 with active power management
  • Compatible, app agnostic - works with iOS, Android, and Windows
  • Standalone, ergonomic - integrated keyboard and sunlight readable LCD
  • Rugged, industrial - IP65 rated for water and dust, industrial temerature range

Bluetooth GNSS Receiver & Datalogger

Bad Elf Flex delivers 30-60cm1 positioning without any additional subscription or cost. Compatible with phones or tablets for use in GIS, mapping, agriculture, and survey data collection.

On-demand data logging includes:

  • Raw data loging in RINEX format for post-processing
  • NMEA logging in standard NMEA 0183 format
  • Available stand-alone or through the Bad Elf application

Survey Grade Rover & Mapping-Grade GNSS
Powered by Bad Elf

Sunlight-readable display with integrated keypad provides for easy field operation.

Businesses spoke and we listened. The modern paridigm for field data collection must address the needs of the way a competivite business operates. Surveyors and their crews have a scalable survey-grade receiver. GIS managers can focus on flexible field choices for work crews with varying skill levels.

Financially speaking, Bad Elf Flex solves the following business considerations.

  • Acquisition of hardware is expensed versus capitalized
  • One set of hardware for their field crews requiring minimal training
  • Other services and subscriptions apply to operational budgets or projects

Looking to learn more about use in GIS, see our GIS Resources for detailed infromation and advanced usage.

App Support

Fully compatible with Android, iOS and Windows location aware applications3. The Bad Elf Flex meets all requirements under Apple's MFi program, and works great with any location-based app in the App Store.

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1GPS L1 and SBAS
2Battery life is also dependent on temperature and use of L-Band services
3See specifications for minimum OS versions

Flex Standalone

In SBAS enabled regions, Bad Elf Flex achieves 30 cm - 60 cm accuracies compatible with sub-meter GIS use. Simply pair the receiver with your tablet or phone and all location aware apps become sub-meter enabled. No additional software or special configuration required.

  • Daily cost - none
  • Training - none

Metro Operation

Operating in metro areas? Bad Elf Flex provides sub-meter capability for GIS use, perfect for your GIS field crews. Do you need to record precise locations for underground or above ground assets? Simply consume one Bad Elf Flex Token and use precision RTK with the Bad Elf app built-in NTRIP client. With proper usage, your field crews can achieve centemeters in minutes.

  • Daily cost of one Bad Elf Flex Token
  • Use your preferred CORS or VRS network

Remote Operation

Do you operating in areas without cellular coverage? Bad Elf Flex is capable of operating practilly anywhere in the world using L-Band satellite delived corrections. Using Atlas provides positioning accuracies down to 5 cm RMS in many applications. Convergence times of 10 – 40 minutes. Options available for use of Atlas sattelite-based corrections include:

  • Daily cost of one Bad Elf Flex Token or,
  • Subscrioption from 1 month to 1 year for longer-term usage

Flex Extreme Bundle

If you require an RTK survey-grade rover for use more than 30 to 40 days a year, consider the extreme bundle. Purchase at time of sale or after without any penalty. The Bad Elf Flex Extreme bundle includes the following unlocked services:

  • Daily cost - none
  • Fully unlocked RTK engine
  • Multiple-constellation enabled
  • Multiple-frequency enabled

Bad Elf Flex Tokens

Bad Elf Flex Tokens are stored on your Bad Elf Flex and available for use regardless of data coverage. Just load your Flex with tokens sufficient for the number of days you plan to work remotely. You may purchase Bad Elf Flex tokens directly through the app on iOS or Android, or from the web site. Flex tokens don't expire and remain on your receiver until you use them.

Each Bad Elf Flex token is good for a 24 hour period from your first position lock. Ready for maximum flexibility? Bad Elf Flex is the only receiver GNSS receiver to provide daily options for high accuracy. With one Flex token you can freely switch between these options:

  • Unlock multi-constellation and multi-frequency for higher accurcacy SBAS
  • Use RTK with your local CORS or VRS network for centimeter level results
  • Use L-Band satellite corrections for places you don't have a data connection or SBAS availability

Part Number


Positioning Engine1

L1CA / L1P / L1C / L2P / L2C / L5
G1/G2/P code (P1/P2)
B1/B2/B3 (separate variant without L5)
E1BC / E5a / E5b
L1CA / L1C / L2C / L5

Positioning Performance

Horizontal accuracy
RTK SBAS (WAAS) Autonomous L-Band via Atlas
Timing (1PPS) accuracy
20 ns
Cold start time
< 60 s typical (no almanac or RTC)
Warm start time
< 30 s typical (almanac and RTC)
Hot start time
< 10 s (almanac, RTC, and position)
Maximum speed
1,850 kph (999 kts)
Maximum altitude
18,288 m (60,000 ft)
Differential options
SBAS, Autonomous, External RTCM v2.3, RTK v3, L-band (Atlas), and DGPS
Correction I/O protocol
Hemisphere GNSS’ ROX, RTCM v2.3 (DGPS), RTCMv3 (RTK), CMR, CMR+, Atlas


USB 2.0 device via Mini-USB receptacle USB 2.0 host OTG via supplied adapter
Bluetooth V4.0 (HS) with integrated Class 1.5 PA Supports 3 simultaneous connections
Client and access point (AP) modes 802.11b/g/n


iOS, Android, Windows
Mobile App
The Bad Elf GPS App requires iOS 8.0+
Bluetooth SPP, USB Serial

Operating Specifications

–20°C to +55°C (–4°F to +131°F)
Battery Powered
14°F to 140°F (-10°C to 60°C)
Externally Powered
-22°F to 140°F (-30°C to 60°C)
Charging Temp
41°F to 113°F (5°C to 45°C)
Storage Temp
–40°C to +75°C (–40°F to +167°F)

Mechanical Specifications

User interface
Transflective LCD
Membrane Buttons
3 multicolor LEDs
Audible tones
10.0” x 2.75” / 254mm x 70mm
29oz / 854g
Helical Antenna Phase Center
22cm above base of Flex unit without adapter installed
Add 1.5cm with adapter installed

Environmental Specifications

100% condensing

Product Specifications

USB Port
Mini-USB port for charging and ElfPort expansion
400 x 240 pixel transflective LCD screen with backlight
Field upgradeable via app or USB

Package Contents

Package Contents
BE-GPS-5500 Flex receiver
3ft (90cm) Mini-USB cable for charging
12-24V DC vehicle USB charger
Wall adapter
Accessory case
Detachable neck lanyard
Rugged waterproof tool case
5/8" x 11 to 1/4" x 20 adapater
User's Manual (downloadable PDF here)
1Constellations and frequencies are dependent on receiver configuration and subscriptions.
*Prices and specification subject to change without notice.
© 2019, Bad Elf, LLC. Google Play and the Google Play logo are trademarks of Google LLC. Apple, the Apple logo, and the App Store logo are trademarks of Apple Inc., registered in the U.S. and other countries.

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