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How to log data for OPUS


You can record logs for OPUS only on Reach M2 as the service supports only multi-band receivers.

This guide shows how to record logs for NOAA's Online Positioning User Service (OPUS) and download them using ReachView 3.

NOAA's Online Positioning User Service or simply OPUS is a service that allows processing GNSS observations and producing geodetic coordinates referenced to both National Spatial Reference System (NSRS) and a global reference frame. The service requires recording static data on the stationary unmoving receiver.


To learn more about OPUS, check this tutorial.


OPUS allows calculating coordinates of a static point only on the territory of the United States.

Record logs

To record logs for OPUS, follow the steps below:

  1. Go to the Logging screen in ReachView 3.

  2. Tap Settings in the Raw data section.

  3. Select the RINEX format in the Raw data section.


    If you do not know which version of RINEX you need, we recommend using RINEX 3.03.


    While recording in the RINEX format, you can record the UBX file as a backup. Tap the gear icon to access Logging settings and check the box marked Backup source data for RINEX.

  4. Select the preset for OPUS.

  5. Use the antenna height, if necessary.

  6. Fill in the point's name in the Marker name field.

  7. Tap Apply.


    You can start recording automatically when your receiver is turned on. Check the corresponding field in the settings.

  8. Enable log recording by tapping Start recording.

  9. Stop log recording by tapping the End recording button.


    Wait for data processing to finish.

Download logs

To download logs, follow the steps below:

  1. Go to the Logs section at the bottom of the Logging screen.


    You can also find information on the logs size and recording date and time here.

  2. Tap the Download logs button.

  3. Save your log depending on the device you use.


    If you do not need your logs anymore, you can delete them using the Edit button.

When the logs are downloaded, you can start working with your data using the OPUS service.