# FAQ

## Getting Started

**How do I connect quickly?**

Follow the [Quick Start](https://docs.rtkdata.com/get-started/quick-start), then check the [Network & Mountpoints](https://docs.rtkdata.com/get-started/network) page. In short: use the regional hostname (NA/EU/AUS), Port `2101`, mountpoint `AUTO` (ALL CAPS), and make sure your app or device sends NMEA GGA to the caster.

**What is GNSS RTK in simple terms?**

RTK is a real-time correction method that uses fixed base stations and streams corrections to your rover over the internet (NTRIP), delivering centimeter-level accuracy in open sky.

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## Connection & Settings

**Which server (host) should I use?**

Use the hostname closest to you. If your device only accepts numbers or DNS is blocked, use the IP fallback:

| Region        | Hostname          | IP Fallback     | Port   |
| ------------- | ----------------- | --------------- | ------ |
| North America | `rtk.rtkdata.com` | `13.56.117.10`  | `2101` |
| Europe        | `eu.rtkdata.com`  | `3.73.41.96`    | `2101` |
| Australia     | `aus.rtkdata.com` | `54.206.56.130` | `2101` |

**Which mountpoint should I choose?**

Use `AUTO` unless your workflow explicitly needs a global frame. AUTO applies the regional frame automatically (e.g., NAD83(2011) in the US, ETRS89 in Europe, GDA2020 in Australia). For global frames choose `AUTO_WGS84` or `AUTO_ITRF2020`.

**Do I need to send GGA?**

Yes. The caster needs your position (NMEA GGA) to select the nearest base station. Enable "Send GGA to caster" in your app or device. See [NTRIP & GGA Essentials](https://docs.rtkdata.com/integration-hub/ntrip-clients-and-field-software/ntrip-and-gga-essentials).

**What correction format should my rover accept?**

RTCM 3.x over NTRIP. Most modern GNSS receivers and apps support this out of the box.

***

## Accuracy, Frames & Heights

**What accuracy should I expect?**

In open sky: \~1–2 cm horizontal and 2–4 cm vertical with RTK FIX. Sky view, antenna quality, and distance to the nearest base station all affect results.

**What's the difference between AUTO, AUTO\_WGS84 and AUTO\_ITRF2020?**

* **AUTO** — applies the regional frame automatically (NAD83 / ETRS89 / GDA2020 / NZGD2000)
* **AUTO\_WGS84** — uses global WGS84
* **AUTO\_ITRF2020** — uses ITRF2020
* **AUTO\_ITRF2014** — uses ITRF2014

Pick the one that matches your project's coordinate system.

**Why do my elevations look "off"?**

RTKdata delivers ellipsoidal heights. Apply a geoid model (e.g., EGM2008, GEOID18, AUSGeoid2020) in your GIS or field software to get orthometric heights (mean sea level). See [Understanding Heights](https://docs.rtkdata.com/get-started/understanding-heights).

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## Coverage & Performance

**Is coverage limited to North America, Europe, and Australia?**

No — those are regional server endpoints. Coverage is global with 20,000+ reference stations. The network assigns the nearest base using your GGA position, regardless of which endpoint you connect to. Always validate with a quick outdoor FIX test.

**When does RTK perform best?**

In open environments with clear satellite view and minimal multipath (away from trees, buildings, metal structures).

***

## Devices & Compatibility

**What equipment is compatible?**

Any rover, drone, or app that supports NTRIP and RTCM 3.x. See the [Integration Hub](https://docs.rtkdata.com/integration-hub/integration-hub) for step-by-step guides covering DJI, Emlid, Trimble, Leica, ArduSimple, and more.

**Do I need my own base station?**

No. RTKdata is a Network RTK service — the 20,000+ reference stations act as your base. You only need your rover and an internet connection.

**How many devices can I use per subscription?**

One active connection at a time. If a second device connects with the same credentials, the first gets disconnected. For simultaneous use, add data streams from your [account dashboard](https://rtkdata.com/my-account/).

***

## Accounts, Plans & Billing

**Do you offer a free trial?**

Yes — 30 days, full access, no credit card required. It ends automatically. [Start Free Trial](https://rtkdata.com/try-rtk-corrections-free-for-30-days/)

**What are the prices?**

See the [Pricing](https://rtkdata.com/pricing/) page for current monthly, annual, and 5-year plans.

**Can I cancel and resume later?**

Yes. Manage your subscription from your [account dashboard](https://rtkdata.com/my-account/). No lock-in, no penalties.

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## Troubleshooting & Support

**I'm connected but getting no corrections.**

Almost always: GGA is not being sent. Enable "Send GGA to caster" in your app settings, confirm mountpoint = `AUTO` (ALL CAPS), and ensure you're outdoors. See [Troubleshooting & FAQ](https://docs.rtkdata.com/support/troubleshooting-and-faq).

**Which port should my firewall allow?**

TCP `2101` outbound.

**How do I contact support?**

Email <support@rtkdata.com>. Include your username, region/host, mountpoint, device model, and screenshots of your NTRIP settings and RTK status.

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## Legal & Company

* [Imprint](https://rtkdata.com/imprint/)
* [Privacy Policy](https://rtkdata.com/privacy-policy/)
* [Terms of Service](https://rtkdata.com/terms/)