How to Use APEKS MAX5 as an RTK Base Station for DJI Enterprise Drones: Complete Field SOP
The APEKS MAX5 GNSS receiver functions as a universal, high-performance base station for DJI enterprise drone platforms (including the DJI Matrice 300/350 RTK and Mavic 3 Enterprise series), broadcasting RTCM 3.2 corrections via an internal NTRIP caster or local Wi-Fi/4G hotspot into DJI Pilot 2. Delivering multi-constellation satellite tracking across 1408 channels and simultaneous raw RINEX observation logging at up to 20 Hz, the MAX5 enables both real-time RTK positioning and high-reliability PPK trajectory processing for aerial LiDAR and photogrammetry missions, eliminating proprietary base-station lock-in.
1. Why Use APEKS MAX5 Instead of Proprietary Drone Base Stations?
Proprietary drone base stations, such as the DJI D-RTK 2, are designed primarily for closed-ecosystem drone operations. While effective within their specific operational scope, they present severe limitations for commercial surveying firms: they cannot readily serve as high-power UHF bases for conventional land survey rovers, lack open NTRIP broadcasting flexibility, and represent an expensive single-purpose investment.
The APEKS MAX5 Super Base solves this challenge by serving as an open-architecture, dual-purpose geodetic instrument. Equipped with a 1408-channel tracking engine, an integrated 5W long-range LoRa UHF radio, full 4G LTE cellular telemetry, and an open WebUI caster, the MAX5 simultaneously transmits differential corrections to aerial drones and ground rover crews (such as the AP40 Laser+ or AP80 Pro) across project baselines up to 25 km.
2. Hardware Architecture & Supported DJI Drone Platforms
The APEKS MAX5 integrates multi-frequency tracking across GPS (L1/L2/L5), BeiDou (B1I/B2I/B3I/B1C/B2a/B2b), GLONASS (L1/L2/L3), Galileo (E1/E5a/E5b/E6), and QZSS. When deployed as a base station for aerial mapping, it provides differential corrections across all major DJI enterprise models:
- DJI Matrice 350 RTK / Matrice 300 RTK: Paired with Zenmuse L1/L2 aerial LiDAR sensors or Zenmuse P1 45MP full-frame photogrammetry cameras.
- DJI Mavic 3 Enterprise (M3E / M3T): Compact aerial surveying and thermal inspection aircraft utilizing RTK expansion modules.
- DJI Matrice 30 Series (M30 / M30T): Emergency response and public safety mapping platforms requiring immediate coordinate georeferencing.
3. Real-Time NTRIP Broadcasting to DJI Pilot 2
To feed real-time RTK corrections into the drone's flight controller, the APEKS MAX5 broadcasts RTCM 3.2 differential messages directly over an IP network. The drone connects to the MAX5 via the Custom Network RTK profile inside the DJI Pilot 2 application.
| Parameter | APEKS MAX5 WebUI Setting | DJI Pilot 2 Configuration |
|---|---|---|
| Operating Mode | Base Station (Static / Known Point) | RTK Mode: Custom Network RTK |
| Differential Protocol | RTCM 3.2 (MSM4 / MSM7) | Auto-decoded via NTRIP Client |
| Connection Link | Internal 4G Caster / Local Wi-Fi AP | NTRIP Host IP & Port Number |
| Data Output Rate | 1 Hz (1-second correction interval) | RTK Position Latency: <1.0s |
| Mountpoint & Auth | Configured Caster Mountpoint Name | Matching Mountpoint, User, Password |
4. PPK Post-Processing Workflow & Raw RINEX Logging
In high-interference environments, deep mountain valleys, or areas lacking cellular coverage, maintaining an unbroken real-time RTK link between the base station and drone can be challenging. For these conditions, Post-Processed Kinematic (PPK) is the standard industry method.
The APEKS MAX5 supports autonomous high-rate raw GNSS observation logging directly to internal storage. During flight, the drone logs its camera shutter events and raw satellite observations, while the MAX5 records stationary base data at 1 Hz, 5 Hz, or 10 Hz in standard RINEX 3.02 / 3.04 formats.
After landing, operators import the MAX5 base RINEX file and the drone's raw observation folder into post-processing suites (such as DJI Terra, Inertial Labs PCMaster, or TerraPos). The software executes forward and reverse Kalman filtering against the MAX5 base coordinates, computing antenna positions with sub-centimeter relative precision and updating image EXIF geotags prior to orthomosaic reconstruction.
5. Step-by-Step Field Deployment SOP
Deploy the heavy-duty survey tripod over a known geodetic benchmark pillar. Level the tribrach using the optical or laser plummet, then lock the APEKS MAX5 securely onto the 5/8-inch mounting thread.
Measure the antenna slant height from the benchmark marker to the measuring line of the MAX5 casing. Input the exact height and antenna type into the MAX5 WebUI or ApekSurv field software to ensure accurate vertical phase center offsets (PCO).
Power on the MAX5. Via the integrated touchscreen or smartphone WebUI, activate the internal NTRIP caster or 4G data server broadcasting RTCM 3.2 MSM7 messages. Concurrently start raw RINEX 3.04 static logging as a backup for PPK processing.
Power on the DJI enterprise controller and launch DJI Pilot 2. Enter the Custom Network RTK settings, connect to the MAX5 mountpoint, and verify that the aircraft displays RTK Converged / RTK Fixed with horizontal and vertical standard deviations below 1.5 cm.
Execute the automated flight grid. While the drone maps overhead, use an APEKS rover connected to the same MAX5 base station via UHF radio to shoot independent Ground Control Points (GCPs) and independent Checkpoints for post-flight quality assurance.
6. FAQ
Can APEKS MAX5 broadcast RTK corrections directly to DJI drones without internet?
Yes. The APEKS MAX5 can create a local Wi-Fi access point running an internal NTRIP server. By connecting the DJI enterprise remote controller (Smart Controller Enterprise or RC Plus) to the MAX5 Wi-Fi network, the drone receives real-time RTK corrections via the local IP address without requiring an active SIM card or public cellular internet connection.
What accuracy can I achieve using APEKS MAX5 with DJI Matrice 350 RTK and Zenmuse L2 LiDAR?
When operating over a verified local control point with differential corrections from the MAX5, a DJI Matrice 350 RTK equipped with Zenmuse L2 achieves vertical elevation accuracy within 2 to 3 cm and horizontal accuracy within 1.5 cm at flight altitudes between 80 m and 120 m, validated against ground checkpoints.
How does APEKS MAX5 compare to the DJI D-RTK 2 mobile station?
The DJI D-RTK 2 is limited to DJI proprietary communication protocols and cannot readily serve as a conventional surveying base station for mixed-brand rovers. The APEKS MAX5 is an open-architecture geodetic base featuring a 5W internal UHF radio (up to 25 km range), standard RTCM 3.2 output, and NOAA NGS antenna calibration, allowing it to support DJI drones and land survey rovers simultaneously.
Can MAX5 be used as both an aerial drone base and a land surveying base simultaneously?
Yes. The MAX5 supports concurrent multi-channel data distribution. It can stream RTCM corrections via cellular NTRIP to an airborne drone while simultaneously broadcasting UHF radio corrections on 410–470 MHz to ground rovers measuring property boundaries or ground check marks.
ONE BASE STATION. TOTAL DRONE & LAND FREEDOM.
Pair the APEKS MAX5 with your DJI enterprise drone fleet for reliable NTRIP and PPK georeferencing — 5W long-range UHF coverage and universal compatibility without vendor lock-in.
Standards & Technical Manuals
- RTCM 10403.3 — Differential GNSS (Global Navigation Satellite Systems) Services
- ASPRS Positional Accuracy Standards for Digital Geospatial Data (Edition 2, 2024)
- APEKS MAX5 Super Base Operations Manual & WebUI Network Configuration Guide, 2026
- DJI Enterprise Pilot 2 Network RTK Integration Guide