> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt # SparkFun Timing GNSS Breakout - mosaic-T **Type:** Product page · **SKU:** GPS-28731 · **Brand:** [Sparkfun](https://core-electronics.com.au/brands/sparkfun-australia) **Page:** https://core-electronics.com.au/sparkfun-mosaic-t-precision-gnss-timing-breakout.html ([markdown](https://core-electronics.com.au/sparkfun-mosaic-t-precision-gnss-timing-breakout.html.md)) At the heart of our Timing GNSS Breakout is Septentrio's mosaic-T, a compact, ultra-low power, multi-band, multi-constellation, high-precision GNSS timing... ## Pricing - **Price:** $1,369.95 (inc GST) — $1,245.41 AUD, exc GST - **Quantity discounts:** 5+ $1208.05 (exc GST) · 25+ $1183.14 (exc GST) · 100+ $1133.32 (exc GST) ## Availability & dispatch - Out of stock — the product page offers email notification when it returns. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=GPS-28731:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart. - **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/GPS-28731:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.) - **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there. - **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works) - **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt ## Description At the heart of our Timing GNSS Breakout is [Septentrio](https://www.septentrio.com/en)'s mosaic-T, a compact, ultra-low power, multi-band, multi-constellation, high-precision GNSS timing receiver. It can achieve a timing precision of 5ns (5 billionths of a second), or better than 1ns with an optional subscription to the Fugro AtomiChron® L-band timing service. Event accuracy is better than 20ns. It also features Septentrio's unique [AIM+ technology](https://www.septentrio.com/en/learn-more/advanced-positioning-technology/aim-jamming-protection) for interference mitigation and anti-spoofing, ensuring best-in-class reliability and accuracy. This board provides easy access to the mosaic-T's reference clock. Want to create your disciplined oscillator? With this board, you can. You can use the `RxClkBias` from the mosaic-T `PVTCartesian` or `PVTGeodetic` SBF messages to discipline your 10MHz oscillator. The *EXT REF* connector accepts 50 Ohm, 10MHz signals in the range of -14dBm (min) to +14dBm (max). The *INT EXT* slide switch selects the internal or external oscillator. The mosaic-T is a sophisticated timing receiver that runs an internal web server, accessible through the USB interface with a standard browser on a Linux or Windows computer. Septentrio also provides dozens of [video tutorials](https://www.youtube.com/@SeptentrioGNSS/videos) to guide users through the configuration settings of their GNSS receivers utilizing the web interface. Beyond the capabilities of the mosaic-T module, this board is easy to operate, requiring no programming skills. Gone are the days when a microcontroller was required to interface with a GNSS receiver and log data to an SD card, and when users had to carry around an SD card reader to extract the data from the card. The mosaic-T Timing GNSS Breakout can start or stop logging data, or mount or unmount the SD card, without requiring a single line of code, simply by utilizing a simple button. Once unmounted, the SD card can be accessed as mass storage for file transfer over USB. For the users who prefer a command-line interface, Septentrio has you covered. Users can still control and configure the mosaic-T module through a CLI, which is helpful for scenarios such as production line testing *(in fact, that is how Sparkfun tested this board)*. This breakout board is a perfect middle ground for users who would like to integrate the mosaic-T module into a project or enclosure with access to a majority of the module's available pins, similar to Septentrio's developer kit, but in the smaller form factor of their evaluation kit. Or maybe... You just needed a very accurate PPS output at a 3.3V logic level. *Please, check out our [hookup guide](https://docs.sparkfun.com/SparkFun_GNSS_mosaic-T) for more details on the capabilities of this board (that Sparkfun couldn't fit in this product description).* ### Features & Specs **Timing GNSS Breakout:** - mosaic-T GNSS Receiver - USB-C Connector - µSD Card Slot (up to 32GB with FAT32 file system) - SMA Connectors: - GPS Antenna (Active, Multi-band) - External 10MHz Reference input (min: -14dBm, max: +14dBm) - Status LEDs - Power (Red) - Pulse-Per-Second (Yellow) - Data Logging (Green) - Position/Velocity/Time Solution (Blue) - RTK Mode (White) (RTK is not supported on the mosaic-T) - Buttons - Log - I/O Logic-Level: 3.3V - 6-pin JST GH connector (GHR-06V-S) - Polarized - Locking - ESD Protection Diodes **mosaic-T Module:** - Voltage Range: 3.135 to 3.465V - Max current: 500mA - Channels: 448 (simultaneous tracking) - GNSS Support - GPS: L1C/A, L1PY, L2C, L2P, L5 - GLONASS: L1CA, L2CA, L2P, L3 CDMA - Beidou: B1I, B1C, B2a, B2b, B2I, B3 - Galileo: E1, E5a, E5b, E5 AltBoc, E6 - QZSS: L1C/A, L1 C/B, L2C, L5 - NavIC: L5 - SBAS: Egnos, WA - Time to Fix - Cold Start: < 45s - Warm: < 20s - Reacquisition: 1s - Timing Precision: 5ns - Better than 1ns with an optional subscription to Fugro AtomiChron - Event Accuracy: better than 20ns - Update Rate: 10Hz - Latency: < 10ms - Antenna voltage: 3.3V - Max current: 150mA - Interfaces: - UART (x4) - USB 2.0 with Ethernet-over-USB and TCP/IP support - SD Card - GPIO/LEDs ### Documentation - [Schematic](https://core-electronics.com.au/attachments/localcontent/schematic_19615c898f2.pdf) - [KiCad Files](https://core-electronics.com.au/attachments/localcontent/kicad_files_68739e6dccb.zip) - [Board Dimensions](https://core-electronics.com.au/attachments/localcontent/71456_6f778e1d8b58ab2f033130dc786a810f.png) - [Hookup Guide](https://docs.sparkfun.com/SparkFun_GNSS_mosaic-T) - Software: [RxTools](https://www.septentrio.com/en/products/gps-gnss-receiver-software/rxtools) - Component Datasheets: - [mosaic-T Datasheet](https://core-electronics.com.au/attachments/localcontent/mosaic_hardware_manual_v1_3896681e0a5.pdf) - [mosaic-T Brochure](https://core-electronics.com.au/attachments/localcontent/Septentrio_mosaic-T_LR_new_37179006bce.pdf) - [Firmware Manual *(v4.14.10.1)*](https://core-electronics.com.au/attachments/localcontent/mosaic-T_Firmware_v4_2146926c1f6.pdf) - [Septentrio's GNSS Modules](https://web.septentrio.com/SF-SSN-home) - [mosaic-T Product Page](https://web.septentrio.com/SF-SSN-module) - [Building a GNSS System](https://www.sparkfun.com/gps) - [GitHub Hardware Repository](https://github.com/sparkfun/SparkFun_GNSS_mosaic-T) ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/G/P/GPS-28731-1.jpg)