Quick Answer
Emlid Flow is the mobile app used with Reach GNSS receivers for RTK surveying. You can create projects, choose coordinate systems like OSGB36, collect points, run stakeout, and export data from your phone. If you need linework, code libraries, and map layers, the Survey plan unlocks those features.
What Emlid Flow Does in a Real Survey Workflow
Emlid Flow is designed to keep the field process simple. Pair a receiver such as the Emlid Reach RS4, connect RTK corrections, then collect points in one app. You can use it for topographic checks, setting out, and ground control capture without switching between multiple tools.
For many UK teams, the biggest win is consistency. You can set the job up in the office, then open the same project in the field with the same coordinate settings and code structure. If you are new to Reach hardware, start with our guide on how to set up Emlid Reach base and rover for RTK surveying.
Emlid Flow works alongside Emlid Flow 360, so projects and settings stay in sync across mobile and browser sessions. That means your survey list, code libraries, and project details are available when you need them, rather than buried on one device.
Getting Your First Project Ready
Open the app, sign in, and create a project before heading out. Set the coordinate system first. For most UK jobs, OSGB36 / EPSG:27700 is the expected working grid. If a required geoid or projection file needs downloading, do that while you still have reliable internet.
Then pair your receiver. The Emlid Reach RS4 Pro and other Reach units connect through Wi-Fi or Bluetooth, depending on your setup. Add your NTRIP credentials in the corrections section, confirm an RTK fix, and only then start collecting points.
If your work includes site walks, utility checks, or pre-construction surveys, keep links to relevant product ranges handy: GPS Modules and GPS & Navigation Systems. It helps when you need to standardise equipment across multiple crews.
Standard vs Survey Plan
The free tier is enough for many point-based jobs. The paid plan becomes useful when you need richer coding, background layers, and stronger line-based workflows.
| Feature | Standard (Free) | Survey Plan |
|---|---|---|
| Point collection and basic stakeout | Yes | Yes |
| Line collection and line stakeout | No | Yes |
| Code libraries and custom attributes | Basic | Advanced |
| Background maps (WMS/WMTS) and richer layers | No | Yes |
If those advanced features match your workflow, the Emlid Flow Survey Plan (Annual) is the upgrade to look at. If your jobs are mainly checkpoints and straightforward point capture, stay on Standard until you hit practical limits.
Collecting Points, Stakeout, and Export
Point collection is direct: wait for stable RTK status, tap collect, add a clear point name, and store an observation note if needed. For stakeout, load your target points and follow distance and direction guidance on screen until you are within tolerance.
Exports are available in common formats such as CSV, DXF, SHP, and KML, so you can move data into CAD, GIS, or client reporting workflows without extra conversion steps. For a broader comparison of Reach hardware before scaling up, see Emlid Reach RTK GNSS Receivers: Complete Guide.
FAQ
Q: Do I need mobile data in the field?
A: You need data for NTRIP correction services unless you are using a local radio/base setup. Project prep and coordinate downloads should be done before leaving the office.
Q: Is Emlid Flow usable for UK coordinate systems?
A: Yes. It supports standard systems used in UK surveying, including OSGB36 workflows where appropriate for the project specification.
Q: When should I move from Standard to Survey?
A: Move when your team needs consistent linework, stronger coding controls, and map-layer support across repeat jobs. Those are usually the tipping points.