Survey-Grade GNSS Rover

Bad Elf Flex

Professional RTK rover with L-Band corrections and integrated display for demanding field work

30-60cm SBAS Accuracy Flex Standard

8mm RTK Accuracy + 1 ppm

4cm L-Band Atlas RMS Accuracy

11hrs Battery Life RTK Mode

IP65 Waterproof

Buying Options Choosing a Receiver

The Bad Elf Flex Story

Bad Elf Flex democratizes GNSS and economizes field data collection. Our customers shared their needs for lower cost GNSS solutions that include full RTK rover workflow. With pricing starting at USD $2,999*, Bad Elf Flex delivers, with 30-60cm accuracy all day, every day.

Need higher accuracy? Bad Elf Flex tokens provide a USD $25* per day rate for features that typically cost thousands of dollars. This daily rate includes full access to both an unlocked RTK workflow and the Atlas L-Band correction service. Bad Elf Flex is the first GNSS receiver to have a daily choice with unlimited switching between L-Band and RTK.

The Bad Elf Flex delivers customers a comparative advantage in a total geospatial solution. A single GNSS receiver removes the need for deploying multiple devices in the field.

Key Features

Designed for surveyors and GIS professionals who demand accuracy, reliability, and versatility

🎯

Accurate

1 cm RTK via NTRIP • 4-5 cm via L-Band satellite corrections worldwide • 30-60 cm via SBAS • Post-processing capable • Multi-frequency, multi-constellation support

💰

Affordable

Pricing starting at USD $2,999* • Extreme option starting at USD $5,999* • Bad Elf Flex Tokens available for USD $25* per 24-hr period

🔧

Versatile

Portable, self-contained design • 11-hr battery life with active power management • App agnostic - works with iOS, Android, and Windows • Integrated keyboard and sunlight-readable LCD

🛰️

Multi-Constellation

GPS, GLONASS, Galileo, BeiDou, QZSS, and IRNSS support for exceptional reliability in challenging environments

📡

L-Band Corrections

Atlas L-Band satellite corrections for remote areas without cellular coverage. Convergence times of 10-40 minutes for 4cm RMS accuracy

💪

Rugged Design

IP65-rated waterproof housing • Industrial temperature range (-22°F to +140°F) • 29oz / 854g weight • Designed for demanding outdoor environments

Bluetooth GNSS Receiver & Datalogger

Bad Elf Flex delivers 30-60cm accuracy 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 logging in RINEX format for post-processing
NMEA logging in standard NMEA 0183 format
Available standalone or through the Bad Elf Flex app

Survey-Grade Rover & Mapping-Grade GNSS

Customers spoke and we listened. The modern paradigm for field data collection must address the needs of the competitive business. Surveyors and their crews now 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 GNSS hardware is expensed versus capitalized
One set of hardware for field crews requiring minimal training
Other services and subscriptions can be expensed to operational budgets or projects

Looking to learn more about using the Bad Elf Flex for GIS? See our GIS Resources for detailed information and advanced usage.

Universal App Support

Fully compatible with Android, iOS and Windows location-aware apps. The Bad Elf Flex meets all requirements under Apple's MFi program, and works great with any location-based app. Learn More...

Choose Your Configuration

Start with Standard and upgrade anytime, or go straight to Extreme for maximum accuracy

Flex Standard

Perfect for GIS & Mapping

✓ 30-60cm SBAS accuracy
✓ Multi-frequency, multi-constellation
✓ No subscription required
✓ Field upgradeable to Extreme
✓ Bluetooth, USB & WiFi connectivity
✓ 11-hour battery life (RTK)
✓ Integrated display & keypad

BE-GPS-5500

Flex Extreme

Professional RTK Solution

✓ 8mm + 1ppm RTK accuracy
✓ 4cm L-Band Atlas accuracy
✓ Fully unlocked RTK engine
✓ All Standard features
✓ RTCMv3 corrections support
✓ Atlas L-Band corrections
✓ No ongoing costs

BE-GPS-5500 + Extreme Activation

Flexible Operation Modes

Standard Mode

In SBAS-enabled regions, Bad Elf Flex achieves 30-60 cm accuracy sufficient for sub-meter GIS use. Simply pair the receiver with your tablet or phone and all location-aware apps become sub-meter capable.

• Daily cost: None
• Multi-constellation: Standard
• Training: None required

Metro Operation (RTK)

Operating in metro areas? Bad Elf Flex provides sub-meter capability for GIS use. Need to record precise locations? Enable Extreme mode and use precision RTK with the built-in NTRIP client. Achieve centimeter accuracy in minutes.

• Daily cost: One Flex Token (USD $25)
• Use your preferred CORS or VRS network

Remote Operation (L-Band)

Collecting data in areas without cellular coverage? Bad Elf Flex is capable of operating anywhere in the world using L-Band satellite-delivered corrections. Atlas® provides accuracy down to 4 cm RMS with convergence times of 10-40 minutes.

• Daily cost: One Flex Token (USD $25)
• Subscription options available (1 month to 1 year)

Bad Elf Flex Tokens

Bad Elf Flex Tokens are stored on your Bad Elf Flex and available for use anytime and anywhere. Just load your Flex with tokens sufficient for the number of days you plan to work remotely. You can purchase Bad Elf Flex Tokens directly through the Bad Elf Flex app on iOS or Android, or online from bad-elf.com. Bad Elf 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 GNSS receiver to provide daily options for high accuracy. With one Bad Elf Flex Token, you can freely switch between these options:

Unlock multi-frequency
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

Technical Specifications

Detailed specifications for both Standard and Extreme configurations

Specification Flex Standard Flex Extreme

Part Number BE-GPS-5500 BE-GPS-5500 + Activation

🛰️ Positioning Engine

GPS L1CA/L1P/L1C/L2P/L2C/L5

GLONASS G1/G2/G3, P code (P1/P2)

BeiDou B1i/B2i/B3i/B10C/B2A/B2B/ACEBOC

Galileo E1BC/E5a/E5b/E6BC/ALTBOC

QZSS L1CA/L2C/L5/L1C/LEX

IRNSS L5

Note Flex Standard enables only single frequency operation by default. Multi-frequency and RTK are unlocked with an Extreme activation or use of a Flex token.

📍 Positioning Performance

Horizontal accuracy - RTK n/a 8 mm + 1 ppm

Horizontal accuracy - SBAS (WAAS) 0.3m 0.3m

Horizontal accuracy - Autonomous 1.2 m 1.2 m

Horizontal accuracy - L-Band via Atlas n/a 4 cm RMS

Timing (1PPS) accuracy 20 ns

Cold start time < 60s typical (no almanac or RTC)

Warm start time < 30s typical (almanac and RTC)

Hot start time < 10s (almanac, RTC, and position)

Maximum speed 1,850 kph (999 kts)

Maximum altitude 18,288 m (60,000 ft)

Differential options SBAS, Autonomous SBAS, Autonomous, External RTCM v2.3, RTK v3, L-band (Atlas), DGPS

Correction I/O protocol n/a Hemisphere GNSS' ROX, RTCM v2.3 (DGPS), RTCMv3 (RTK), CMR, CMR+, Atlas

🔌 Interfaces & Connectivity

USB USB 2.0 device via Mini-USB receptacle • USB 2.0 host OTG via supplied adapter

Bluetooth Bluetooth V4.0 (HS) with Class 1.5 PA - 3 simultaneous connections

Wi-Fi 802.11b/g/n

Operating Systems iOS, Android, Windows

Mobile App Bad Elf Flex App - iOS 13.4+ or Android 9+

Connectivity Protocol Bluetooth SPP, USB Serial

🌡️ Operating Specifications

Operating Temperature –4°F to +131°F (–20°C to +55°C)

Battery Powered Range -14°F to +140°F (-10°C to +60°C)

Externally Powered Range -22°F to +140°F (-30°C to +60°C)

Charging Temperature 41°F to +113°F (+5°C to +45°C)

Storage Temperature –40°F to +167°F (–40°C to +75°C)

Humidity 100% condensing

Waterproof Rating IP65

🔋 Battery Specifications

Battery Life - Full RTK 11 hours

Battery Life - L-band Atlas 7 hours

📏 Mechanical Specifications

User Interface Transflective LCD • Membrane Buttons • 3 multicolor LEDs • Audible tones

Display 400 x 240 pixel transflective LCD screen with backlight

Dimensions 10.0" x 2.75" / 254mm x 70mm

Weight 29oz / 854g

Helical Antenna Phase Center 23cm above base of Flex unit without adapter installed • Add 1.5cm with adapter installed

Accelerometer 3-axis

Firmware Field upgradeable via app or USB

📦 Package Contents

Included Items BE-GPS-5500 Flex receiver • 3ft (90cm) Mini-USB cable for charging • 12-24V DC vehicle USB charger • Wall adapter • Accessory case • Rugged waterproof case • 5/8" x 11 to 1/4" x 20 adapter • User's Manual (downloadable PDF here)

¹Constellations and frequencies are dependent on receiver configuration and subscriptions.

²Accuracy specified in RMS (67%). Results depend upon sky condition and distance from corrections source. Vertical error typically 1.5x horizontal error specified.

^*Prices and specifications subject to change without notice.

© 2026, 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. Atlas is a trademark of Hemisphere GNSS, Inc.

Bad Elf Flex Image Gallery

View the Bad Elf Flex from every angle

Front View

Integrated display and keypad for standalone operation

Side View

Compact, rugged design for field use

Back View

Standard 5/8" x 11 thread mount

Field Use With Tablet - Front

Mounted on rover pole with tablet

Field Use With Tablet - Side

Professional survey configuration

Remote GCP

Ground control point collection in the field