GeoAstra C2-X20P-U u-blox X20P GNSS Board — RTK, Galileo HAS PPP, All-band L1 / L2 / L5 / L6 (E6), 4G LTE & BLE

The GeoAstra C2-X20P-U is a compact high-precision GNSS board built on the next-generation u-blox X20P engine — not the older dual-band F9-class chips that dominated the last generation of RTK boards. What makes this board stand out is the combination most OEM boards still miss: true satellite-based PPP (no base, no NTRIP subscription required), Bluetooth Classic SPP + BLE (including iOS app access), and built-in 4G LTE so the board can pull RTK corrections by itself. Form factor: 61.3 × 56.5 × 5.8 mm · 18.8 g · USB-C · SMA · VIN 5–30 V. GeoAstra · u-blox X20P (all-band) · Built-in PPP · BLE for iOS · Classic Bluetooth SPP · Built-in 4G LTE / NTRIP · RTK 0.6 cm + 1 ppm · up to 25 Hz 1) Next-Gen u-blox X20P — A Clear Step Beyond F9P For years, many high-precision boards centered on the popular u-blox ZED-F9P (dual-band L1/L2 RTK). The X20P is u-blox’s newer all-band platform — more signals per satellite, stronger availability in difficult sky conditions, and native support for modern correction methods that F9P simply does not offer. Capability Typical F9P-class boards GeoAstra C2-X20P-U (u-blox X20P) GNSS bands Dual-band (mainly L1 / L2) All-band L1 / L2 / L5 / L6 (E6) Correction modes RTK · PPP-RTK RTK · PPP-RTK · Global PPP (incl. Galileo HAS) L-band / satellite corrections Not built into the F9P engine the same way Integrated L-band / global PPP path Update rate Typically up to ~10 Hz RTK Up to 25 Hz (RTK / PPP-RTK / PVT / RAW) Tough sky (urban / canopy) Good in open sky More signals → better availability near buildings / obstacles Channels Lower-channel dual-band class 672 channels → If you already know F9P boards: X20P is the upgrade path for all-band tracking, faster updates, and PPP that works without a local RTK network 2) Built-in PPP — High Accuracy Without RTK Base or NTRIP Most “high-precision” workflows still assume you need something else in the system: an RTK base station (or a paid NTRIP / RTK network subscription), and a real-time radio or internet link between base and rover — or, for PPK, a second logger plus office post-processing later (see our community guide on PPK with Columbus EX-1). Those methods work, but they add cost, setup, and logistics. PPP (Precise Point Positioning) on the X20P is different: the receiver uses correction data delivered from satellites / global PPP services (such as Galileo HAS), so you can get high-precision results without deploying your own base and without an NTRIP account. No RTK subscription service required for the PPP path No local RTK base to install, power, or survey-in No NTRIP caster / cellular phone tether just to receive corrections for PPP Typical PPP accuracy on this platform: horizontal < 10 cm, vertical < 20 cm (RMS) Also supports PPP-RTK (< 6 cm H) when SSR / SPARTN-style services are available → Turn on the board, track satellites, and get high-precision positioning from the sky — without building an RTK infrastructure first 3) Bluetooth SPP + BLE — Including Direct iOS App Access Many GNSS boards only offer Classic Bluetooth SPP (fine for Android / Windows serial apps) — or no Bluetooth at all. The GeoAstra C2-X20P-U supports both: Bluetooth Classic SPP — familiar serial-port style links for Android / PC tools Bluetooth Low Energy (BLE) — the path Apple allows for third-party accessories Because BLE is supported, an iOS app can talk to the board directly. That is a major advantage over SPP-only receivers that cannot be opened as a normal serial device on iPhone / iPad. Use it with the GeoAstra BLE-GNSS iOS app (and compatible phone workflows) to configure and work with the board without adding a separate Bluetooth bridge module. → One GeoAstra board that works with Android / desktop SPP and iOS via BLE — rare on OEM GNSS boards 4) Built-in 4G LTE — RTK / NTRIP Without Another Internet Device When you do want classic RTK (highest accuracy, shortest convergence), most boards still need a phone, tablet, or external modem to reach an NTRIP caster. The GeoAstra C2-X20P-U already has a 4G LTE module and Nano-SIM on board. Insert a SIM and the board can access NTRIP / RTK correction services by itself No need to tether to a phone or pair a separate LTE dongle for internet Cleaner OEM integration: GNSS + cellular in one PCB RTK performance on this platform: 0.6 cm + 1 ppm horizontal · 1.0 cm + 1 ppm vertical (RMS), convergence typically < 7 s → Use PPP when you want zero RTK infrastructure — or use onboard 4G LTE when you want full NTRIP RTK without extra hardware Why These Four Matter Together Remote / rural work Use PPP when there is no nearby base and you do not want a correction subscription. → High precision from satellites alone Network RTK sites Use onboard 4G LTE + NTRIP for centimeter RTK without a phone in the loop. → Self-contained rover board Field apps on phones BLE for iOS and SPP for Android / PC — talk to the board from the tools your team already uses. → Fewer dongles and bridges OEM product design All-band X20P performance in a thin 18.8 g carrier with USB-C, SMA, and 5–30 V VIN. → Ready for robotics, UAVs, and connected instruments Key Specs at a Glance GNSS & Accuracy Engine u-blox X20P · 672 channels · all-band multi-constellation Constellations GPS · BDS · Galileo · QZSS · NavIC · SBAS Modes Single · SBAS · RTK · PPP-RTK · PPP RTK accuracy (RMS) 0.6 cm + 1 ppm (H) · 1.0 cm + 1 ppm (V) PPP-RTK / PPP (RMS) < 6 cm H / < 10 cm V · < 10 cm H / < 20 cm V Update rate Up to 25 Hz TTFF Cold 25 s · Hot / aided 2 s Connectivity (the selling points) Bluetooth Classic SPP + BLE (V5.1) — iOS app capable via BLE Cellular Built-in 4G LTE + Nano-SIM — onboard NTRIP / internet for RTK USB Type-C · 5 V · 9600–460800 bit/s Antenna SMA · 3.3 V / 200 mA bias App / cloud GeoAstra BLE-GNSS (iOS) · GeoAstra mobile / cloud workflow Mechanical & Power Size / weight 61.3 × 56.5 × 5.8 mm · 18.8 g VIN 5 V ~ 30 V (7-pin) · USB-C 5 V Power consumption 800 mW (typical) Temperature −40°C ~ +85°C (operating & storage) I/O headers 7-pin (UART / PPS / VIN) · 6-pin (EVENT / INT) · 1.25 mm pitch Accuracy figures are typical RMS values for the u-blox X20P platform and depend on sky view, antenna, baseline / service quality, and multipath. PPP / PPP-RTK availability depends on supported global or regional correction services (e.g. Galileo HAS). F9P comparison points reflect commonly published ZED-F9P vs ZED-X20P differences from u-blox / industry sources. What's in the Box GeoAstra C2-X20P-U GNSS High-precision Positioning Board × 1 → Nano-SIM and host cables are not included unless listed separately on the product page Optional Antennas The C2-X20P-U uses an SMA antenna port with 3.3 V bias. Pair it with a multi-band high-precision antenna for best RTK / PPP results. Recommended optional accessories from our shop: ByNav BY403 Tri-band Automotive-Grade GNSS Antenna (L1 / L2 / L5, Φ84 mm) — multi-feedpoint survey-style antenna with integrated cable; magnetic / adhesive mount Columbus HAK-1 Tri-Band Helical Antenna Kit (L1 / L2 / L5) — compact IP67 helical kit with magnetic base and SMA cables; ideal for drones, robotics, and mobile mounts → Antenna sold separately — choose BY403 for a larger survey-style mount, or HAK-1 for a light helical kit