Introduction

HD GNSS is a cloud-based service that provides sub-meter positioning for mobile devices. The HERE GNSS Service is offered for various types of client devices to make it possible for them to accomplish the following:

• Shorten the time needed to get the first GNSS-based position estimate, both in online and offline mode.
• Achieve continuous position tracking with much weaker signal levels, both in online and offline mode.
• Reduce power consumption by reducing the time it takes to calculate the current position, both in online and offline mode.
• Improve the overall GNSS position estimate accuracy to sub-meter range in online mode.

The HERE GNSS Service has asynchronous WebSocket API (HERE GNSS API) that supports both single shot requests and subscribing corrections as streaming data. The API uses protobuf messages. The data is returned in the standard LPP UPER encoded format (or as BER encoded for some deprecated data types).

HERE GNSS API provides three types of data that can be purchased as separate products:

• GNSS assistance data
• HD GNSS correction data
• Predicted GNSS assistance data

The HERE GNSS Service supports the following use cases:

• GNSS assistance data is used to shorten the time needed to get the first GNSS-based position estimate. The data is provided to the GNSS positioning engine of the client device. The positioning engine will use this data in connection with the GNSS satellite data it receives through the GNSS receiver of the client device.
• HD GNSS correction data is used to improve the overall GNSS position estimate accuracy, if the GNSS positioning engine of the client device supports usage of SSR corrections.
• Predicted GNSS assistance data allows the client device to store the predicted navigation models to the device and also use them in offline mode for 7 or 14 days.

For information on:

• How to quickly set up and start using the HERE GNSS Service, see Get Started - HERE developer portal.
• The terms and conditions covering this documentation, see the HERE Documentation License.
• How to get support, see Help.
• Pricing, see HERE Positioning.

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For more information on how data privacy is of fundamental importance to HERE and our customers, see the HERE Privacy Charter.