![]() Note that OPUS uses the best available ephemeris data available. The GP helps mitigate multi-path errors and is generally used at base stations with long observation times. The only difference between the two antennas is the present of a ground plane (GP) on the Zephyr Geodetic. This document will describe how to download data collected with a Trimble 5700 receiver collected with either a Trimble Zephyr or Zephyr Geodetic antenna. To use properly, please familiarize yourself with the information provided under the About tab at the OPUS site.” OPUS is highly automated and requires minimal user input. Your computed NSRS position is sent privately via email, and, if you choose, can also be shared publicly via the NGS database. OPUS processes your GPS data files with the same models and tools which help manage the Nation’s Continuously Operating Reference Station (CORS) network, resulting in coordinates which are both highly accurate and highly consistent with other users. “This Online Positioning User Service (OPUS) provides you with simplified access to high-accuracy National Spatial Reference System (NSRS) coordinates: all you need is a clear view of the sky and a survey-grade (preferably dual frequency) Global Positioning System (GPS) receiver. According to the National Geodetic Survey: The Online Positioning User Service ( ) is provided without fees by the National Geodetic Survey.
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