SparkFun

RTK Torch GNSS Base/Rover Surveying Device

Name: RTK Torch GNSS Base/Rover Surveying Device
Brand: SparkFun
SKU: SF-GPS-25662
Price: 4379.0 AUD
Availability: InStock

· MPN: GPS-25662

GPS & Location Sensors

$4,379.00 |

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Built for field surveying, this heavy-duty RTK unit combines a multi-band GNSS receiver, internal antenna, battery, Bluetooth, WiFi and a 915MHz LoRa radio i...

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Built for field surveying, this heavy-duty RTK unit combines a multi-band GNSS receiver, internal antenna, battery, Bluetooth, WiFi and a 915MHz LoRa radio in a rugged enclosed design. It is intended to make Base/Rover setup straightforward while handling rough use across varied environments.

Galileo HAS support lets the Torch achieve <50cm accuracy anywhere in the world without needing a corrections source. Tilt compensation helps capture points that are awkward to reach, such as up against walls or on uneven terrain, while the built-in LoRa radio can connect two Torch units over about 10 miles.

The Torch can be used with PPP corrections, as a Rover, for baseless surveying, or as a temporary base. It includes 1 month of corrections via PointPerfect IP, with coverage dependent on location.

The enclosure is fully waterproof to its IP67 rating, but it is not recommended for permanent outdoor mounting. Hardware documentation, firmware resources, receiver command references, product manuals and component datasheets are available from SparkFun.

Features:

Heavy-duty RTK design: Made to handle diverse environments and rough handling.
Base/Rover setup: Provides a simple and straightforward way to set up a Base/Rover system.
Galileo HAS: Allows the Torch to get <50cm accuracy anywhere in the world without needing a corrections source.
Tilt compensation: Allows surveying points that would otherwise be inaccessible, like up against walls or on uneven terrain.
Built-in LoRa radio: Allows two Torches to be easily connected over a distance of about 10 miles.
PPP corrections: The Torch can be used with PPP corrections.
Rover use: The Torch can be used as a Rover.
Baseless surveying: The Torch can be used for baseless surveying.
Temporary base: The Torch can serve as a temporary base.
PointPerfect IP: Purchase includes 1 month of corrections via PointPerfect IP.
Android support: Field Genius.
Android support: QField.
Android support: QGIS.
Android support: Survey Master.
Android support: SurPad.
Android support: SurvPC.
Android support: SW Maps.
Android support: Vespucci.
Android support: Any GIS software that supports NMEA over Bluetooth or TCP.
iOS support: ArcGIS Survey123.
iOS support: QField.
iOS support: SW Maps.
iOS support: Any GIS software that supports NMEA over TCP.

Specifications:

NGS calibrated: Antenna Phase Center (APC).
APC L1: 131.7mm.
APC L2: 126.2mm.
APC average: 129.0mm.
NGS calibration data: Available.
NGS calibration data file: ANTEX.
NGS calibration data file: ANTINFO.
Overall device enclosure: Enclosed aluminium and plastic design IP67 - Protected from water up to 1 metre for 30 minutes.
Internal antenna: L1/L2/L5 with ≥2.3dBi gain.
Internal battery: LiPo 7.2V 6.8Ah 48.96Wh with fast 10W charging.
Run time: 26+ hours on a full charge.
Control: Single push button control.
Weight: 428g (0.94 lbs).
Dimensions: 71 x 71 x 147mm (2.8 x 2.8 x 5.8in).
GNSS receiver: UM980.
GNSS channels: 1408-Channel concurrent reception of GPS, GLONASS, Galileo, BeiDou, QZSS.
GPS: L1C/A, L1C*, L2P(Y), L2C, L5.
GLONASS: L1, L2.
Galileo: E1, E5a, E5b, E6*.
Beidou: B1I, B2I, B3I, B1C, B2a, B2b*.
QZSS: L1, L2, L5.
SBAS: Supported.
Horizontal accuracy autonomous: 1.5m.
Horizontal accuracy DGPS: 0.4m.
Horizontal accuracy RTK: 0.8cm + 1ppm.
Vertical accuracy autonomous: 2.5m.
Vertical accuracy DGPS: 0.8m.
Vertical accuracy RTK: 1.5cm + 1ppm.
Max altitude: 18km (11 miles).
Max velocity: 515m/s (1152mph).
Band support note: Bands marked with * are only supported by specific firmware.
Bluetooth® transceiver: ESP32 WROOM.
Microprocessor: Xtensa® dual-core 32-bit LX6 microprocessor.
Clock frequency: Up to 240MHz clock frequency.
Flash storage: 16MB of flash storage.
PSRAM: 2MB of PSRAM.
Internal SRAM: 520kB internal SRAM.
WiFi transceiver: Integrated 802.11 BGN WiFi transceiver.
Bluetooth®: Integrated dual-mode Bluetooth® (classic and BLE).
915MHz LoRa radio: STM32WLE.
LoRa microcontroller: Cortex-M4 microcontroller running at 48MHz with built-in LoRa radio.
RF front end: 900MHz SKY65313-21 RF front end 1 Watt amplifier.
Multipoint support: One Base to multiple Rovers.
FHSS support: Supports FHSS 902 to 928MHz.
Compliance: Compliant in North America and South America.

Suitable for survey, mapping and GNSS positioning workflows where a portable RTK Base/Rover or temporary base setup is required.

Jargon buster

Plain-language definitions for the technical terms used above.

B1I: A BeiDou satellite signal used for standard positioning. It matters because the receiver must support the signal bands used by a constellation to take advantage of those satellites.
B2a: A BeiDou satellite signal used by newer dual-band GNSS receivers. Support for B2a can improve accuracy and reliability when combined with other GNSS bands.
BLE: BLE stands for Bluetooth Low Energy, a Bluetooth mode designed for lower power use and modern phone compatibility. It matters because BLE support can make the module easier to use with Apple devices and battery-powered projects, though it may behave differently from classic serial Bluetooth.
E1: A Galileo satellite signal band used for standard positioning. Knowing which signal bands are supported helps you judge compatibility and expected performance of a GNSS receiver.
E5a: A Galileo satellite signal band used for higher-performance positioning services. Support for E5a can help dual-band GNSS receivers improve accuracy and reduce errors from atmospheric delay.
ESP32: ESP32 is a family of microcontroller modules with built-in wireless features such as Bluetooth and WiFi. Knowing this product uses an ESP32-based module helps explain how it provides wireless serial communication and firmware update features.
Galileo: Europe’s satellite navigation system. Galileo support can improve satellite availability and accuracy, especially when combined with GPS and other constellations.
GLONASS: Russia’s satellite navigation system. A receiver that can also use GLONASS has more satellites to choose from, which can improve positioning reliability when the sky view is partly blocked.
GNSS: GNSS stands for Global Navigation Satellite System, covering positioning systems such as GPS and similar satellite networks. It matters here because high-precision GNSS modules can output lots of serial position data that this product can send wirelessly to a computer or phone.
GPS: The US satellite navigation system used by GNSS receivers to calculate position and time. Support for GPS is important because it is widely available and often used together with other constellations for more reliable positioning.
IP67: An ingress protection rating meaning the enclosure is dust-tight and can survive temporary immersion in water under specified test conditions. This matters when choosing a sensor for outdoor, wet, or wash-down environments.
L1C/A: A GPS signal band used by many GNSS receivers for standard positioning. Support for this band helps determine which satellite signals the receiver can use and how well it can maintain a location fix.
L2C: A second GPS signal band used by dual-band GNSS receivers to improve precision and reduce errors caused by the atmosphere. It matters for RTK and high-accuracy applications because using two bands can produce faster and more reliable centimetre-level fixes.
L5: A modern GNSS signal band used by several satellite systems for more accurate and robust positioning. Dual-band receivers that include L5 can often perform better than single-band receivers, especially for RTK and areas with reflected signals.
LiPo: A lithium polymer rechargeable battery commonly used in portable electronics projects. It matters because LiPo batteries need correct charging circuitry and care, and this board includes hardware intended for that battery type.
LoRa: LoRa is a long-range, low-power radio technology often used for telemetry and remote sensors. It matters here because the connector and pinout are compatible with some LoRa telemetry products, even though this module uses Bluetooth instead.
microcontroller: A microcontroller is a small computer on a chip that runs your program and controls connected inputs and outputs. For this product, it is the part that reads buttons and sensors, drives the display and speaker, and communicates over Bluetooth.
QZSS: Japan’s regional satellite navigation system designed to improve coverage around Japan and the Asia-Pacific region. QZSS support can improve satellite availability in supported regions when used alongside GPS.
RF: RF means radio frequency, referring to signals used for wireless communication and other high-frequency electronics. A low-noise, stable power supply is important for RF circuits because power noise can affect signal quality and measurements.
RTK: Real-Time Kinematic positioning is a GNSS technique that uses correction data from a base station to greatly improve location accuracy. It matters if you need centimetre-level positioning for robotics, mapping, surveying, or tracking rather than ordinary metre-level GPS accuracy.
SBAS: Satellite-Based Augmentation System, a set of regional services that broadcast correction information for GNSS receivers. SBAS can improve ordinary GPS-style positioning, although it is not the same as centimetre-level RTK correction.
SRAM: Fast temporary memory used by a processor while a program is running. More SRAM helps with projects that handle larger data buffers, networking, displays, or more complex code.