What is the accuracy difference between Fixed and Float RTK?

Fixed RTK typically delivers ±8 mm horizontal and ±15 mm vertical accuracy. Float RTK carries ±300–1000 mm of positioning error depending on baseline length and atmospheric conditions.

Why does my RTK show Fixed but coordinates are still wrong?

Common causes are a datum mismatch (wrong coordinate system), an incorrect geoid model applied to elevation, or an antenna height entry error.

How do I know if multipath is affecting my survey?

Multipath typically shows as unstable repeated measurements — the same physical point measured three times gives results differing by 20–50 mm rather than the expected ±8 mm.

Can I survey during ionospheric storms?

RTK accuracy degrades during geomagnetic storms (Kp index above 5). For precision engineering or cadastral surveys, postpone sessions until the Kp index drops below 3.

What is the maximum reliable CORS baseline for centimetre accuracy?

Most CORS networks guarantee ±10–20 mm horizontal accuracy within 50 km of the nearest reference station. Beyond 70 km, deploy a self‑deployed base station within 15 km of the survey area.

APEKS FAQ | How to Set Up HAS for High-Precision GNSS — No Internet Needed

2025-06-04

How to Set Up HAS for High-Precision GNSS — No Internet Needed

If you work in remote areas like oceans, deserts, or rural job sites where there's no mobile network or internet, achieving high-precision positioning can be a big challenge. Luckily, HAS (High Accuracy Service) solves this problem — and setting it up is easier than you think.

In this blog post, we'll explain what HAS is, how it works, and how to set it up on your GNSS controller using the APEKSURV Field software.

What Is HAS?

HAS stands for High Accuracy Service — a free positioning service provided by the Galileo satellite system.

It works by broadcasting correction data directly from satellites, including:

·Precise satellite orbit
·Satellite clock corrections
·Code bias(to improve measurement accuracy)

Unlike traditional correction methods, HAS does not require internet access. Everything is sent directly from satellites that remain fixed over the same area in the sky (known as geostationary satellites). This makes HAS perfect for areas with no cellular signal, like offshore projects, desert zones, or rural construction sites.

⚙️ How to Set Up HAS in APEKSURV

Setting up HAS in your APEKSURV Field software is simple. Just follow these steps:

✅ Step-by-Step Setup Guide

1. Open the APEKSURV Field app
2. Connect your device
3. Tap Rover
4. Go to PPP Type
5. Set the mode to HAS
6. Tap Apply

That's it! ✅

Once the mode is applied, you'll see "PPP" on the screen. This indicates the receiver has started working in Precise Point Positioning mode using HAS.

How Accurate Is HAS?

When properly set up and after convergence (usually within 10–15 minutes), HAS can provide positioning accuracy of around 5 centimeters — which is extremely impressive for a free and offline service.

Why Choose HAS?

No internet needed — everything comes via satellite

Global coverage, with best performance in open areas

Free to use, provided by the Galileo satellite system

Ideal for remote and harsh environments

Whether you're working on marine surveys, rural infrastructure, or environmental research in the field, HAS gives you freedom from network limits while still achieving high accuracy.

Get Started Today!

With just a few taps in the APEKSURV Field app, you can unlock powerful high-precision positioning — anytime, anywhere.

Click the link below to send an inquiry and learn more about our products.
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