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Ships within 48 hours · Estimated delivery Jul 9 - Jul 14
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Description
SparkFun RTK Express Surveying KitWe generally recommend using your cellular phone as the radio backhaul for RTCM but you can also use your own, higher power radios as long as they support 57600bps. We also recommend logging all data to your phone over Bluetooth. This is as simple as checking a box within SW Maps. But if you prefer to do long surveys, or need to deal with RAWX measurements where a phone will not be present, a microSD card should be purchased (any size up to 32GB).
We generally recommend using your cellular phone as the radio backhaul for RTCM but you can also use your own, higher power radios as long as they support 57600bps. We also recommend logging all data to your phone over Bluetooth®. This is as simple as checking a box within SW Maps. But if you prefer to do long surveys, or need to deal with RAWX measurements where a phone will not be present, a microSD card should be purchased (any size up to 32GB).
Please keep in mind that you will need to provide your own mono-pod or tripod as well as a cell-phone type holder for securing the RTK Express to your mono-pod or tripod. We've found this style clamp and this style clamp work well. Your mileage may vary.
Note: The L1/L2 antenna has a 5/8" thread which will fit most surveying platforms. The kit includes a 5/8" to 1/4" adapter as well which will fit most camera mono-pods and tripods. You may need additional adapters for your specific equipment.
Features
GNSS Receiver: ZED-F9P
- Concurrent reception of GPS, GLONASS, Galileo and BeiDou
- Receives both L1C/A and L2C bands
- Current: 68mA - 130mA (varies with constellations and tracking state)
- Time to First Fix: 25s (cold), 2s (hot)
-
Max Navigation Rate:
- PVT (basic location over UBX binary protocol) - 25Hz
- RTK - 20Hz
- Raw - 25Hz
-
Horizontal Position Accuracy:
- 2.5m without RTK
- 0.010m with RTK
- Max Altitude: 50km (31 miles)
- Max Velocity: 500m/s (1118mph)
Bluetooth® Transceiver: ESP32 WROOM
- Xtensa® dual-core 32-bit LX6 microprocessor
- Up to 240MHz clock frequency
- 16MB of flash storage
- 520kB internal SRAM
- Integrated 802.11 BGN WiFi transceiver
- Integrated dual-mode Bluetooth® (classic and BLE)
- Hardware accelerated encryption (AES, SHA2, ECC, RSA-4096)
- 2.5 µA deep sleep current
Overall Device
- Internal Battery: LiPo 1300mAh with 500mA charging
- Radio Port: 3.3V TTL Serial (57600bps RTCM TX/RX)
- Data Port: 3.3V TTL Serial (115200bps NMEA)
- Embedded OLED Display for available satellites, data logging, and more.
- Push button controls
- Weight: 162g (entire device including battery)
- Dimensions: 132mm x 101mm x 32mm (5.2in x 3.9in x 1.2in)
- 1x Qwiic Connector
GNSS Multi-Band L1/L2 Surveying Antenna
- Gain: ≥5dBi
- LNA Gain: 40dB
-
Reception Frequencies
- L1: 1555 to 1615MHz
- L2: 1198 to 1278MHz
- 50 Ohm Antenna Impedance
- Overall antenna weight: 335g
- Bare antenna element weight (including MMCX connector, with RF shield): 160g
- Dimensions: 148 x 55mm
- Waterproof IP67
- Connector: Female TNC
Included
- SparkFun RTK Express GNSS Receiver
- RTK Kit Carrying Case
- GNSS L1/L2 Multi-Band Antenna - TOP106
- Antenna Interface Cable - SMA to TNC (300mm)
- 1/4" to 5/8" Antenna Thread Adapter
- USB Wall Charger - 5V, 2A
- USB A to C Cable - 0.8m
- Data Cable
- Radio Cable
Not Included/Optional:
- Camera Mono-pole or Tri-pod
- Phone/Enclosure Holder
- Telemetry Radios - 500mW
- microSD Card - 16GB
Resources
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.3 ★★★★★
Based on 635 reviews
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Product Reviews
★★★★★ 4
Great
Capacity: 32GB
It is very good, 32gb is good for basic pictures, but the one downside is that you cant take out a smaller cd card from this sd card
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 12, 2025
★★★★★ 5
Easy to use, perfect for data/photo storage
Capacity: 32GB
Easy to format and great value for what I needed it for. You can use these cards in a PC, Camera, etc… they are pretty versatile.
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Reviewed in the United States on May 23, 2026
★★★★★ 5
Perfect for what I needed
Capacity: 32GB
Works great!
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Reviewed in the United States on May 21, 2026
★★★★★ 5
Warning: This Journal Will Pull You In
Format: Hardcover, Format: Hardcover
Before I read it, I believed this journal was a kind of encyclopaedia of all the mysteries and unexplained events of Gravity Falls. However, it turned out to be something entirely different—an intriguing work of fiction, a captivating page-turner, and a perfect TV-series companion that everyone should have at hand while watching the adventures of Dipper and Mabel Pines and their friends during that one iconic summer.
★★★★★ Art
This is a one-of-a-kind book! I’ve never come across anything like it. It is, quite literally, a diary—a journal written and designed with 100% authenticity. You’ll find hand-drawn illustrations and handwritten text sections, as if an explorer, researcher, or scientist documented all of their personal experiences while investigating the eerie town of Gravity Falls. Some pages convey pure emotion; others offer meticulous descriptions of the unknown. Altogether, it grips you and doesn’t let go until you reach the final page. Now I truly understand how Dipper felt when he found this journal—excited, curious, and full of wonder. Bravo!
★★★★☆ Text
In addition to everything mentioned above, the text itself is deeply immersive and engaging. The book consists of two main parts (without spoiling the essence): one written by an unknown author, and another by Dipper, who finds the journal and continues it by chronologically recording his and Mabel’s adventures.
The variety of fonts brilliantly reflects different personalities and emotional states: trembling handwriting, unstable and chaotic notes seemingly written by a mad scientist; Dipper’s neat, school-like typeface; and Mabel’s colorful, emotional, and expressive writing—almost as if she’s permanently fueled by a generous dose of sugar.
For readers who enjoy deciphering codes and riddles, the journal contains puzzles and sections written in several ciphers. Personally, though, these felt more decorative than engaging: sitting with a sheet of paper and decoding letter by letter isn’t quite the experience I want from a book like this. I would have preferred overlays, often used in art books, that reveal the decrypted message beneath without breaking the sense of immersion.
★★★★★ Book Design
Starting with the cover—designed to look like a real, well-worn journal—it feels authentic straight away, just like in the show. There are even intentionally distressed areas on the cover, suggesting damage and wear, which adds another layer of believability. Portrait orientation, size, weight, paper quality, font selection—everything is executed with an incredible level of care and love.
The only downside is the dust jacket, which can easily wear out or get lost. Without it, the book title isn’t printed on the cover underneath. Still, since the cover perfectly replicates the journal from the show, this small flaw is easy to forgive.
★★★★★ Price
I still can’t quite understand how such an incredible book can be sold for such a modest price. Perhaps it’s due to the large number of copies available on the market, but even so, it remains one of the best price-to-quality ratios among the books I’ve purchased in recent years—not to mention the overwhelming number of copies available on the pre-owned market.
★★★★★ Overall Impressions
We all know that Gravity Falls is a masterpiece. What I truly regret is that no one ever told me how much more fascinating and immersive the show becomes when you watch it with this journal in hand. You read the first part, get acquainted with the main characters, and then return to the journal after each episode—as if you’re staying right beside them at the end of the day, listening as they write down everything that happened. I could almost smell the wood of the Mystery Shack and hear the evening crickets outside the window while imagining it all.
In short, this journal is an absolute must-have if you’re a fan of the show—or if you have kids of the right age who are ready to watch it and join its worldwide fan community.
The biggest drawback of this journal is that it’s Journal #3. Journals #1 and #2 exist only as single pages shown in the series—forever teasing your imagination and teaching your inner perfectionist to accept this universe as it is, while firmly believing that somewhere in parallel dimensions, Journals #1 and #2 are all-time bestsellers.
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Reviewed in the United States on December 14, 2025
★★★★★ 5
A Must-Have for Gravity Falls Fans
Format: Hardcover
I absolutely loved this book. I’m a big Gravity Falls fan, and having Journal 3 in physical form just feels different. It really feels like the actual journal from the show. There are so many details, drawings, and hidden things that you don’t fully see in the episodes, which makes it even more special.
I was honestly surprised by how well made it is. The pages, the cover, everything looks amazing. I had so much fun reading it and looking for secrets. If you like Gravity Falls, it’s 100% worth buying. I don’t regret it at all. 💛📖
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 12, 2026
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