Positioning settings

To configure how and when differential corrections are applied to collected positions, click and then tap Positioning.

Differential corrections are calculated by comparing the measurements of two different GNSS receivers that are tracking the same GNSS satellites at the same time. One GNSS receiver is located in the field and the other GNSS receiver is located at a base station. The calculated corrections are used to remove atmospheric and multipath errors that may occur and therefore improve the accuracy of the measured position.

The application of differential corrections to autonomous GNSS positions can occur:

  • As they are collected, in real time, using a real-time correction source.

  • After they were collected, using offline GNSS corrections.

Use the Real-time GNSS tab in the Positioning pop-out window to configure real-time GNSS positioning sources to improve location accuracy of your Trimble GNSS device. Configurations linked to workspaces are available for use in field applications.

Sources for real-time GNSS corrections are one of the following services:

  • RTX (Internet): Trimble RTX is a global correction service provided by Trimble, with correction information sent via an internet connection.

  • RTX (Satellite): Trimble RTX is a global correction service provided by Trimble, with correction information sent via satellite.

  • Internet: Internet real-time configurations stream correction information over an internet connection from a VRS network or base station.

  • SBAS: SBAS is a satellite-based correction source that is free to use across most of North America and Europe.

To use the Trimble RTX® service you must have a valid Trimble RTX subscription. For more information, go to positioningservices.trimble.com/en.

To configure the real-time GNSS source, see Real-time GNSS corrections.

Use the Offline GNSS tab in the Positioning pop-out window to enable the application of differential corrections to autonomous GNSS positions after they are collected. When offline GNSS corrections are enabled, real-time GNSS corrections are not required.

To be able to enable offline GNSS corrections, you must be a project administrator. To collect features that will be processed using offline GNSS corrections, field users must be using a TerraFlex Premium license when collecting data in the field.

When features are processed, the GNSS measurements for the collected features are compared to the GNSS measurements provided by a base station provider. The base station provider is selected automatically using a range of criteria including base station location, GNSS constellations and signals tracked, and so on.

Offline GNSS correction processing is completely automatic, including when features are processed, and the selection and download of base station data.

To configure offline GNSS corrections, see Offline GNSS corrections.