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    <geo:formInformation>
      <geo:FormInformation gml:id="form-info">
        <geo:preparedBy>Jake Griffiths</geo:preparedBy>
        <geo:datePrepared>2025-11-20</geo:datePrepared>
        <geo:reportType>UPDATE</geo:reportType>
      </geo:FormInformation>
    </geo:formInformation>
    <geo:siteIdentification>
      <geo:SiteIdentification gml:id="site-identification">
        <geo:siteName>NRL Midway Research Center (Stafford)</geo:siteName>
        <geo:fourCharacterID>MRC1</geo:fourCharacterID>
        <geo:iersDOMESNumber>49654M002</geo:iersDOMESNumber>
        <geo:cdpNumber>none</geo:cdpNumber>
        <geo:monumentDescription codeSpace="urn:ga-gov-au:monument-description-type">DEEP DRILL BRACED MONUMENT</geo:monumentDescription>
        <geo:markerDescription>SCIGN MOUNT MARK</geo:markerDescription>
        <geo:dateInstalled>2017-07-26T00:00:00Z</geo:dateInstalled>
        <geo:geologicCharacteristic codeSpace="urn:ga-gov-au:geologic-characteristic-type">SAND/CLAY</geo:geologicCharacteristic>
        <geo:notes>LINE OF SIGHT TO SLR</geo:notes>
      </geo:SiteIdentification>
    </geo:siteIdentification>
    <geo:siteLocation>
      <geo:SiteLocation gml:id="site-location">
        <geo:city>Stafford</geo:city>
        <geo:state>Virginia</geo:state>
        <geo:countryCodeISO codeList="http://xml.gov.au/icsm/geodesyml/codelists/country-codes-codelist.xml#GeodesyML_CountryCode" codeListValue="AUS" codeSpace="urn:xml-gov-au:icsm:egeodesy:0.5">United States of America (the)</geo:countryCodeISO>
        <geo:tectonicPlate codeSpace="urn:ga-gov-au:plate-type">NORTH AMERICAN</geo:tectonicPlate>
        <geo:approximatePositionITRF>
          <geo:cartesianPosition>
            <gml:Point gml:id="itrf_cartesian">
              <gml:pos srsName="EPSG:7789">1092811.8197 -4877221.9707 3948968.109</gml:pos>
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          </geo:cartesianPosition>
          <geo:geodeticPosition>
            <gml:Point gml:id="itrf_geodetic">
              <gml:pos srsName="EPSG:7912">38.4990996503 -77.3706495593 </gml:pos>
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          </geo:geodeticPosition>
        </geo:approximatePositionITRF>
        <geo:notes>LINE OF SIGHT TO SLR</geo:notes>
      </geo:SiteLocation>
    </geo:siteLocation>
    <geo:gnssReceiver>
      <geo:GnssReceiver gml:id="gnss-receiver-1">
        <geo:manufacturerSerialNumber>3016634</geo:manufacturerSerialNumber>
        <geo:igsModelCode codeList="http://xml.gov.au/icsm/geodesyml/codelists/antenna-receiver-codelists.xml#GeodesyML_GNSSReceiverTypeCode" codeListValue="SEPT POLARX5" codeSpace="urn:xml-gov-au:icsm:egeodesy:0.5">SEPT POLARX5</geo:igsModelCode>
        <geo:satelliteSystem>GPS+GLO+GAL+BDS</geo:satelliteSystem>
        <geo:firmwareVersion>5.1.1</geo:firmwareVersion>
        <geo:elevationCutoffSetting>0</geo:elevationCutoffSetting>
        <geo:dateInstalled>2017-07-26T00:00:00Z</geo:dateInstalled>
        <geo:dateRemoved>2019-03-12T18:43:00Z</geo:dateRemoved>
        <geo:temperatureStabilization/>
      </geo:GnssReceiver>
      <geo:dateInserted>2017-07-26T00:00:00Z</geo:dateInserted>
    </geo:gnssReceiver>
    <geo:gnssReceiver>
      <geo:GnssReceiver gml:id="gnss-receiver-2">
        <geo:manufacturerSerialNumber>3016634</geo:manufacturerSerialNumber>
        <geo:igsModelCode codeList="http://xml.gov.au/icsm/geodesyml/codelists/antenna-receiver-codelists.xml#GeodesyML_GNSSReceiverTypeCode" codeListValue="SEPT POLARX5" codeSpace="urn:xml-gov-au:icsm:egeodesy:0.5">SEPT POLARX5</geo:igsModelCode>
        <geo:satelliteSystem>GPS+GLO+GAL+BDS</geo:satelliteSystem>
        <geo:firmwareVersion>5.2.0</geo:firmwareVersion>
        <geo:elevationCutoffSetting>0</geo:elevationCutoffSetting>
        <geo:dateInstalled>2019-03-12T18:44:00Z</geo:dateInstalled>
        <geo:dateRemoved>2019-09-30T17:30:00Z</geo:dateRemoved>
        <geo:temperatureStabilization/>
      </geo:GnssReceiver>
      <geo:dateInserted>2019-03-12T00:00:00Z</geo:dateInserted>
    </geo:gnssReceiver>
    <geo:gnssReceiver>
      <geo:GnssReceiver gml:id="gnss-receiver-3">
        <geo:manufacturerSerialNumber>3016634</geo:manufacturerSerialNumber>
        <geo:igsModelCode codeList="http://xml.gov.au/icsm/geodesyml/codelists/antenna-receiver-codelists.xml#GeodesyML_GNSSReceiverTypeCode" codeListValue="SEPT POLARX5" codeSpace="urn:xml-gov-au:icsm:egeodesy:0.5">SEPT POLARX5</geo:igsModelCode>
        <geo:satelliteSystem>GPS+GLO+GAL+BDS</geo:satelliteSystem>
        <geo:firmwareVersion>5.3.0</geo:firmwareVersion>
        <geo:elevationCutoffSetting>0</geo:elevationCutoffSetting>
        <geo:dateInstalled>2019-09-30T17:30:00Z</geo:dateInstalled>
        <geo:dateRemoved>2020-03-12T18:47:00Z</geo:dateRemoved>
        <geo:temperatureStabilization/>
      </geo:GnssReceiver>
      <geo:dateInserted>2019-09-30T00:00:00Z</geo:dateInserted>
    </geo:gnssReceiver>
    <geo:gnssReceiver>
      <geo:GnssReceiver gml:id="gnss-receiver-4">
        <geo:manufacturerSerialNumber>3016634</geo:manufacturerSerialNumber>
        <geo:igsModelCode codeList="http://xml.gov.au/icsm/geodesyml/codelists/antenna-receiver-codelists.xml#GeodesyML_GNSSReceiverTypeCode" codeListValue="SEPT POLARX5" codeSpace="urn:xml-gov-au:icsm:egeodesy:0.5">SEPT POLARX5</geo:igsModelCode>
        <geo:satelliteSystem>GPS+GLO+GAL+BDS</geo:satelliteSystem>
        <geo:firmwareVersion>5.3.2</geo:firmwareVersion>
        <geo:elevationCutoffSetting>0</geo:elevationCutoffSetting>
        <geo:dateInstalled>2020-03-12T18:47:00Z</geo:dateInstalled>
        <geo:dateRemoved/>
        <geo:temperatureStabilization/>
      </geo:GnssReceiver>
      <geo:dateInserted>2020-03-12T00:00:00Z</geo:dateInserted>
    </geo:gnssReceiver>
    <geo:gnssAntenna>
      <geo:GnssAntenna gml:id="gnss-antenna-1">
        <geo:manufacturerSerialNumber>5150</geo:manufacturerSerialNumber>
        <geo:igsModelCode codeList="http://xml.gov.au/icsm/geodesyml/codelists/antenna-receiver-codelists.xml#GeodesyML_GNSSAntennaTypeCode" codeListValue="SEPCHOKE_B3E6 SPKE" codeSpace="urn:xml-gov-au:icsm:egeodesy:0.5">SEPCHOKE_B3E6   SPKE</geo:igsModelCode>
        <geo:antennaReferencePoint codeSpace="urn:ga-gov-au:antenna-reference-point-type">BPA</geo:antennaReferencePoint>
        <geo:marker-arpUpEcc.>0.0083</geo:marker-arpUpEcc.>
        <geo:marker-arpNorthEcc.>0.0000</geo:marker-arpNorthEcc.>
        <geo:marker-arpEastEcc.>0.0000</geo:marker-arpEastEcc.>
        <geo:alignmentFromTrueNorth>0</geo:alignmentFromTrueNorth>
        <geo:antennaRadomeType codeSpace="urn:igs-org:gnss-radome-model-code">SPKE</geo:antennaRadomeType>
        <geo:radomeSerialNumber/>
        <geo:antennaCableType>LMR600</geo:antennaCableType>
        <geo:antennaCableLength>45</geo:antennaCableLength>
        <geo:dateInstalled>2017-07-26T00:00:00Z</geo:dateInstalled>
        <geo:dateRemoved/>
      </geo:GnssAntenna>
      <geo:dateInserted>2017-07-26T00:00:00Z</geo:dateInserted>
    </geo:gnssAntenna>
    <geo:frequencyStandard>
      <geo:FrequencyStandard gml:id="frequency-standard-1">
        <geo:standardType codeSpace="urn:ga-gov-au:frequency-standard-type">INTERNAL</geo:standardType>
        <gml:validTime>
          <gml:TimePeriod gml:id="frequency-standard-1-time-period-1">
            <gml:beginPosition>2017-07-26</gml:beginPosition>
            <gml:endPosition>2019-06-20</gml:endPosition>
          </gml:TimePeriod>
        </gml:validTime>
        <geo:notes/>
      </geo:FrequencyStandard>
      <geo:dateInserted>2017-07-26T00:00:00Z</geo:dateInserted>
    </geo:frequencyStandard>
    <geo:frequencyStandard>
      <geo:FrequencyStandard gml:id="frequency-standard-2">
        <geo:standardType codeSpace="urn:ga-gov-au:frequency-standard-type">EXTERNAL H-MASER</geo:standardType>
        <geo:inputFrequency>10.0</geo:inputFrequency>
        <gml:validTime>
          <gml:TimePeriod gml:id="frequency-standard-2-time-period-1">
            <gml:beginPosition>2019-06-20</gml:beginPosition>
            <gml:endPosition/>
          </gml:TimePeriod>
        </gml:validTime>
        <geo:notes/>
      </geo:FrequencyStandard>
      <geo:dateInserted>2019-06-20T00:00:00Z</geo:dateInserted>
    </geo:frequencyStandard>
    <geo:collocationInformation>
      <geo:CollocationInformation gml:id="collocation-information-1">
        <geo:instrumentationType codeSpace="urn:ga-gov-au:collocation-information-type">SLR</geo:instrumentationType>
        <geo:status codeSpace="urn:ga-gov-au:collocation-information-type">PERMANENT</geo:status>
        <gml:validTime>
          <gml:TimePeriod gml:id="collocation-information-1-time-period-1">
            <gml:beginPosition>2002-08-01</gml:beginPosition>
            <gml:endPosition/>
          </gml:TimePeriod>
        </gml:validTime>
      </geo:CollocationInformation>
      <geo:dateInserted>2002-08-01T00:00:00Z</geo:dateInserted>
    </geo:collocationInformation>
    <geo:humiditySensor>
      <geo:HumiditySensor gml:id="humidity-sensor-1">
        <geo:type codeSpace="urn:ga-gov-au:humidity-sensor-type">WXT536</geo:type>
        <geo:manufacturer>Vaisala</geo:manufacturer>
        <geo:serialNumber>N2130569</geo:serialNumber>
        <geo:heightDiffToAntenna/>
        <geo:calibrationDate/>
        <gml:validTime>
          <gml:TimePeriod gml:id="humidity-sensor-1-time-period-1">
            <gml:beginPosition>2017-07-26</gml:beginPosition>
            <gml:endPosition/>
          </gml:TimePeriod>
        </gml:validTime>
        <geo:dataSamplingInterval/>
        <geo:accuracy-percentRelativeHumidity/>
        <geo:aspiration/>
      </geo:HumiditySensor>
      <geo:dateInserted>2017-07-26T00:00:00Z</geo:dateInserted>
    </geo:humiditySensor>
    <geo:pressureSensor>
      <geo:PressureSensor gml:id="pressure-sensor-1">
        <geo:type codeSpace="urn:ga-gov-au:pressure-sensor-type">WXT536</geo:type>
        <geo:manufacturer>Vaisala</geo:manufacturer>
        <geo:serialNumber>N2130569</geo:serialNumber>
        <geo:heightDiffToAntenna/>
        <geo:calibrationDate/>
        <gml:validTime>
          <gml:TimePeriod gml:id="pressure-sensor-1-time-period-1">
            <gml:beginPosition>2017-07-26</gml:beginPosition>
            <gml:endPosition/>
          </gml:TimePeriod>
        </gml:validTime>
        <geo:dataSamplingInterval/>
        <geo:accuracy-hPa/>
      </geo:PressureSensor>
      <geo:dateInserted>2017-07-26T00:00:00Z</geo:dateInserted>
    </geo:pressureSensor>
    <geo:temperatureSensor>
      <geo:TemperatureSensor gml:id="temperature-sensor-1">
        <geo:type codeSpace="urn:ga-gov-au:temperature-sensor-type">WXT536</geo:type>
        <geo:manufacturer>Vaisala</geo:manufacturer>
        <geo:serialNumber>N2130569</geo:serialNumber>
        <geo:heightDiffToAntenna/>
        <geo:calibrationDate/>
        <gml:validTime>
          <gml:TimePeriod gml:id="temperature-sensor-1-time-period-1">
            <gml:beginPosition>2017-07-26</gml:beginPosition>
            <gml:endPosition/>
          </gml:TimePeriod>
        </gml:validTime>
        <geo:dataSamplingInterval/>
        <geo:accuracy-degreesCelcius/>
        <geo:aspiration/>
      </geo:TemperatureSensor>
      <geo:dateInserted>2017-07-26T00:00:00Z</geo:dateInserted>
    </geo:temperatureSensor>
    <geo:localEpisodicEffect>
      <geo:LocalEpisodicEffect gml:id="local-episodic-effect-1">
        <gml:validTime>
          <gml:TimePeriod gml:id="local-episodic-effect-1-time-period-1">
            <gml:beginPosition>2017-09-15</gml:beginPosition>
            <gml:endPosition>2017-09-15</gml:endPosition>
          </gml:TimePeriod>
        </gml:validTime>
        <geo:event>Installed concrete retaining wall blocks around
base of DDBM to protect from commercial mowers.
The blocks are each about 20 cm thick, and the
wall is two layers tall.</geo:event>
      </geo:LocalEpisodicEffect>
      <geo:dateInserted>2017-09-15T00:00:00Z</geo:dateInserted>
    </geo:localEpisodicEffect>
    <geo:localEpisodicEffect>
      <geo:LocalEpisodicEffect gml:id="local-episodic-effect-2">
        <gml:validTime>
          <gml:TimePeriod gml:id="local-episodic-effect-2-time-period-1">
            <gml:beginPosition>2018-05-02</gml:beginPosition>
            <gml:endPosition>2018-05-02</gml:endPosition>
          </gml:TimePeriod>
        </gml:validTime>
        <geo:event>Planted low-lying blue juniper ground cover
beneath antenna and within the circular
retaining wall to keep animals from digging.
Had been keeping weeds out of this box, but the
bare ground attracted a few burrowing animals.</geo:event>
      </geo:LocalEpisodicEffect>
      <geo:dateInserted>2018-05-02T00:00:00Z</geo:dateInserted>
    </geo:localEpisodicEffect>
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      <gmd:CI_ResponsibleParty>
        <gmd:individualName>
          <gco:CharacterString>Reed Smith</gco:CharacterString>
        </gmd:individualName>
        <gmd:organisationName>
          <gco:CharacterString>U.S. Naval Research Laboratory</gco:CharacterString>
        </gmd:organisationName>
        <gmd:contactInfo>
          <gmd:CI_Contact>
            <gmd:phone>
              <gmd:CI_Telephone>
                <gmd:voice>
                  <gco:CharacterString>202-767-3305</gco:CharacterString>
                </gmd:voice>
                <gmd:voice>
                  <gco:CharacterString>703-551-1876</gco:CharacterString>
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                <gmd:facsimile>
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            </gmd:phone>
            <gmd:address>
              <gmd:CI_Address>
                <gmd:deliveryPoint>
                  <gco:CharacterString>4555 Overlook Ave SW
Washington, DC  20375</gco:CharacterString>
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                  <gco:CharacterString>reed.smith@nrl.navy.mil</gco:CharacterString>
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            </gmd:address>
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    </geo:siteContact>
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                <gmd:voice>
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Washington, DC  20375</gco:CharacterString>
                </gmd:deliveryPoint>
                <gmd:electronicMailAddress>
                  <gco:CharacterString>jake.griffiths@nrl.navy.mil</gco:CharacterString>
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      </gmd:CI_ResponsibleParty>
    </geo:siteMetadataCustodian>
    <geo:moreInformation>
      <geo:MoreInformation gml:id="more-information">
        <geo:dataCenter>CDDIS</geo:dataCenter>
        <geo:dataCenter>NONE</geo:dataCenter>
        <geo:urlForMoreInformation/>
        <geo:siteMap/>
        <geo:siteDiagram/>
        <geo:horizonMask/>
        <geo:monumentDescription/>
        <geo:sitePictures/>
        <geo:antennaGraphicsWithDimensions/>
        <geo:insertTextGraphicFromAntenna>


    </geo:insertTextGraphicFromAntenna>
        <geo:DOI codeSpace="urn:ga-gov-au:self.moreInformation-type">TODO</geo:DOI>
      </geo:MoreInformation>
    </geo:moreInformation>
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