2 Pack GPS+BDS Dual-Mode Module Flight Control Satellite Positioning Navigator, ATGM336H (AT6558/ATGM336H-5N)
Quick take
This 2-pack GNSS module set uses the ATGM336H-5N/AT6558 chipset for multi-constellation positioning, with GPS and Beidou as a common starting mode. It is best for builders who want serial data output and timing features for embedded projects, but it is not a complete ready-to-go navigation device, so setup, antenna placement, and UART wiring matter.
Pros and cons
Pros
- Supports multiple satellite systems, including GPS and BDS (and more, depending on configuration)
- Low-power design for continuous operation (specified as under 25mA at 3.3V)
- Strong sensitivity targets (cold start capture sensitivity listed at -148dBm)
- Reviewers report fast resume from a restart after acquiring a 3D fix outdoors
Cons
- Not plug-and-play, you will need to integrate power and serial interfaces
- Indoor acquisition can be inconsistent, especially when RF interference is nearby
- There can be a practical antenna connector/layout issue if components sit too close
What buyers think
Buyer-review evidence is broadly positive, with recurring themes around GNSS performance and integration behavior rather than brand new feature complaints. Multiple buyers describe good tracking and lock behavior after a successful outdoor acquisition, including quick re-acquisition after power cycling. Indoors, acquisition often takes longer and can fail without adequate signal or with nearby RF sources, such as stronger transmit devices, that can desensitize the receiver.
There is also some limited evidence of an integration/layout gotcha related to the external antenna connector placement, where physical contact with nearby components could cause electrical trouble. That suggests you should plan the mechanical layout and keep power rails and nearby parts clear of the antenna connector region.
What you are getting (and what it is for)
This is a compact dual-mode GNSS positioning module pair based on the ATGM336H-5N family (AT6558 chip). It is aimed at embedded and DIY use cases where you want satellite positioning data, typically over a serial interface, rather than a full dashboard navigation unit.
It is commonly discussed for projects involving Arduino, ESP32, and single-board computers. It is also positioned for car positioning, handheld positioning, and wearable applications, which usually implies small form-factor integration.
Supported navigation systems and key positioning targets
The module family is designed for multi-constellation GNSS reception. The listed system support includes:
- GPS
- China’s BDS (Beidou)
- GLONASS
- Galileo
- QZSS
- SBAS (satellite augmentation systems like WAAS, EGNOS, GAGAN, and MSAS)
For performance expectations, the product targets include:
- Cold start capture sensitivity: -148dBm
- Tracking sensitivity: -162dBm
- Positioning accuracy: 2.5 meters CEP50 (open ground)
- First positioning time: 32 seconds
Power is listed for continuous operation at under 25mA at 3.3V, making it more compatible with battery-powered or always-on setups than many higher-draw GNSS solutions.
How well it works in real usage
Outdoor acquisition and tracking
Reviewers describe getting satellite lock and valid fixes, with one pattern being that outdoor acquisition can take a short but noticeable amount of time, then tracking becomes stable. After maintaining a 3D fix long enough to receive needed navigation message information, a restart was reported to lead to valid fixes quickly (in the same order of seconds).
Indoor performance and interference
Indoor use is where expectations should be managed. Evidence is mixed, with some buyers unable to cold-start indoors until time-of-week or other data eventually came through. In another case, indoor acquisition became difficult when a Bluetooth dongle was close to the receiver, suggesting RF interference can matter.
Practical takeaway: if you are designing an embedded product that will often be indoors or near other transmitters, plan for antenna placement, spacing, and shielding, and expect that indoor acquisition may be slower or inconsistent compared to open-sky outdoor conditions.
Integration considerations for arduino, ESP32, and raspberry pi
- Power: the design is specified for 3.3V operation, which helps when pairing with typical microcontroller logic levels.
- Data interface: reviewers mention UART connections and the use of PPS (Pulse Per Second) for timing discipline. Your firmware will need to configure the receiver and parse positioning output.
- Antenna connector and layout: there is limited evidence of an antenna connector mechanical issue when nearby components sit too close and can lead to unintended electrical contact. If your build puts the 3.3V power area near the antenna connector, add clearance and avoid “touching” contact paths.
Pros and cons recap
Good fit if you want a small GNSS module for embedded work, you can provide a proper external antenna and clear mechanical layout, and you are comfortable integrating serial data in your code.
Skip it if you need a ready-to-use dashboard navigation device with a dedicated screen and complete mapping experience. This product is a positioning module component, not a self-contained consumer navigation unit.
Price and availability
These are sold as a 2-pack and are currently offered as an in-stock item in the listing you are viewing. For the latest price and shipping conditions in the US, check the live Amazon page.
Alternatives to consider (by buyer priorities)
Since no specific competing products were provided, here are common alternative paths based on what you care about:
- If you want simpler wiring: look for GNSS modules that explicitly bundle a well-documented plug-and-play UART interface and include full example code for your target MCU (Arduino/ESP32).
- If you need better indoor reliability: prioritize solutions that are designed with high-performance indoor antennas or include active antenna options and clear guidance for antenna placement and RF shielding.
- If you want a “whole device” experience: choose a consumer GPS navigation head unit rather than a raw positioning module, especially if your project is not meant to be firmware-heavy.
Verdict
The ATGM336H-5N based 2-pack is a practical choice for DIY GNSS projects that need multi-constellation capability and timing-friendly outputs, with power draw designed for embedded builds. The main caveats are integration complexity and indoor acquisition sensitivity to antenna placement and nearby RF interference, so plan your layout carefully.
FAQ
Does this module come as a complete navigation device with a screen?
No. It is a GNSS positioning module intended for integration into your own electronics and software, not a standalone navigation unit.
Will it work with Arduino or ESP32?
It is designed for embedded positioning uses, and reviewers report it working in Arduino and ESP32-style setups when properly connected and configured. You will still need to handle power and serial communication in your project.
How is indoor performance?
Indoor acquisition can be inconsistent. Open-sky outdoor conditions tend to be much more reliable, and strong nearby transmitters can interfere with satellite acquisition.
What satellite systems does it support?
The module family is designed to support GPS, BDS (Beidou), GLONASS, Galileo, QZSS, and SBAS (augmentation systems), with configurations typically controlling which constellations are used.
What power does it require?
Power draw is listed as under 25mA for continuous operation at 3.3V, which aligns with common MCU supply and logic-level environments.
Specifications
| Product Title | 2 Pack GPS+BDS Dual-Mode Module Flight Control Satellite Positioning Navigator, ATGM336H Replacement NEO-M8N NEO-6M for Arduino |
|---|---|
| Category | Automotive > Replacement Parts > Lighting & Electrical > Electrical > Global Positioning Systems |
| Brand | DWEII |
| Manufacturer | DWEII |
| Model Name | ATGM336H-5N |
| Compatible with Vehicle Type | Car |
| Screen Size | 6 Inches |
| Additional Features | Multi-constellation support |
| Connectivity Technology | Vehicle-specific wired connection |
| Map Types | Satellite |
| Mounting Type | Dashboard Mount, found in image |
| Touch Screen Type | Resistive |
| Display Type | LCD |
| Human-Interface Input | Touchscreen |
| Compatible Devices | Smartphone |
| Control Method | Touch |
| Are Batteries Included | No |
| Supported Satellite Navigation System | GPS |
| Built-In Media | Dashboard Mount |
| UPC | 701715520028 |
| Mfr Part Number | DWEII |
| Vehicle Service Type | Car |
| Special Feature | Multi-constellation support |
| Map Type | Satellite |
| Included Components | Dashboard Mount |
Available variants
Color
- 2PCS
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