High-accuracy data collection has come a long way since the USA launched the first GNSS constellation, GPS, in the 1970s. Today, all you need to get started with submeter or centimeter data collection is a smart device, a collection app, and a GNSS receiver that works with both.
What is the difference between the ellipsoid, mean sea level, geoid, geoid height, and orthometric height — and which one is right? Learn how the ellipsoid elevation your GPS receiver captures relates to the geoid, how to convert between the two so you can start using your data, and why most GPS receivers don't output the orthometric height you rely on.
SBAS are a free source of sub-meter location data corrections for your GPS / GNSS receivers. You can use any of the 5 SBAS that exist today. This article gives you an overview of the five SBAS and shows you how to get free GPS sub-meter corrections with SBAS satellite systems.
On December 31st, 2016, just before midnight, a positive leap second was inserted into the Coordinated Universal Time (UTC). This leap second added to GLONASS may have introduced disruption at the exact moment. Arrow Series™ receivers affected (e.g., Arrow 200, Arrow Gold) will automatically update a new almanac.
For iOS and Bluetooth™ to be useful together, an accessory (like the high-accuracy Arrow GNSS receiver) and a device (e.g., a tablet) must support in common one of Bluetooth's standard profiles. A Bluetooth headset, for instances, would use HeadSet Profile (HSP).