Station summaryUSN3

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  • GPS
    Tide Gauge
IGS-type acronym : USN3
Latitude : 38.92056472
Longitude : -77.06627389
Installed date : 2004-06-28
Decommissioned date : 2014-11-19
Country : U.S.A.
Station status : Decommissioned (white and red cross)
Distance to Tide Gauge (m) : 6525
Domes Nr.: 40451S007
Station operator: (USNO) - U.S. Naval Observatory
IGS-like station form :

GPS position times seriesUSN3


(Reference epoch: )

Offsets (mm)

MMaterial change or malfunction
RFReference Frame change
NANot available
Position discontinuity
Velocity discontinuity
Vertical component
East component
North Component

Data available at SONELUSN3

Quality plots on RINEX filesUSN3

Quality plots on RINEX files of USN3 Quality plots on RINEX files of USN3 Royal Observatory of Belgium

Plots generated using software developed with the EPN team at ROB
Observations & tracking performance Satellite tracking

informations (this operation may take 20 to 45s)

The satellite tracking graph has been calculated for all stations for the first day of each month. If you wish to have a graph for another date, choose the 'Calculate a specific date' option.

Comparison with satellite altimetry data

Co-located instrumentsUSN3

History of the stationUSN3

USN3 renamed USN7 in nov 2014

Log bookUSN3

[IGSSTATION-6287] - 2015-08-24 (24/08/2015)

Back in November 2014 the antenna mount for USN3/USN4/USN5 was raised 1.5m. At that time USN3 was renamed to USN7. USN4/USN5 should have also been renamed at the same time since all three share the same antenna. The replacement station names for USN4/USN5 are USN8/USN9.

[IGSSTATION-6030] - 2014-11-20 (25/11/2014)

Urgent: USN3 antenna type and location (height) has been significantly changed.

At least one daily 30s file from Nov 18 was unintentionally published
which did not include necessary changes in metadata (RINEX header).
Processing will result in a position that is ~5 -feet- higher than nominal.

Suggest not using any subsequent USN3 data until further notice.

IGS Data centers should remove these erroneous files.

Data will be backfilled with appropriate headers as soon as the entire
scope of the change is fully documented.