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NAQU Message

NAQU is an abbreviation of "NOTICE ADVISORY TO QZSS USERS".

It is the QZSS version of the NANU(NOTICE ADVISORY TO NAVSTAR USERS) which the US Coast Guard Navigation Center gives out for information on GPS.

NAQUs are announced from the MCS to the users to give information of the QZSS status. They include: outage of service, reports of anomaly, forecast of events, etc.

Users will get NAQU messages to read in this web page or to follow the Twitter account: "@QZSS_Status".

  • Details of NAQU format

    • NAQU function of MADOCA-PPP in trial service will be implemented in September 2023. Please see the following link for operational information of MADOCA-PPP until then.

  • MADOCA-PPP operation information
    • NAQU notification times typically vary by NAQU group. Nominal NAQU notification times for the four NAQU groups are summarized in Table
    NAQU Group Nominal Notification Times
    Forecast Outages 48 hrs prior to outage start
    Unscheduled Outages Less than 1 hr after outage start
    Other No Nominal - Timing determined on a case-by-case basis
    Resumed service Less than 1 hr after resumed service*
    *There are a few exceptional cases due to failure.

    The cell color of the list means below.

    Forecast Outages

    Unscheduled Outages

    Other

    Resumed service

    The operational status of each satellite operated by QZSS can be confirmed on Constellation status.

    Current effective NAQUs that indicate the notice of outage of service, forecast of events, etc. can be confirmed too.

  • Check Constellation status

    • Select data

    NAQU Message 2023

    page 1 / 1
    DATE PNT SLAS DC Report CLAS
    L1C/A L1C L2C L5 L1S L6
    2023/05/30
    2023/05/23
    2023/05/07
    2023/05/04
    2023/05/02
    2023/04/25
    2023/04/17
    2023/04/17
    2023/04/17
    2023/04/04
    2023/03/30
    2023/03/30
    2023/03/30
    2023/03/29
    2023/03/29
    2023/03/29
    2023/03/29
    2023/03/29
    2023/03/29
    2023/03/29
    2023/03/29
    2023/03/25
    2023/03/20
    2023/03/20
    2023/03/20
    2023/03/20
    2023/03/20
    2023/03/20
    2023/03/20
    2023/03/20
    2023/03/18
    2023/03/18
    2023/03/18
    2023/03/18
    2023/03/18
    2023/03/18
    2023/03/18
    2023/03/18
    2023/03/18
    2023/03/18
    2023/03/18
    2023/03/18
    2023/03/15
    2023/03/15
    2023/03/14
    2023/03/11
    2023/03/11
    2023/03/05
    2023/03/01
    2023/03/01
    2023/03/01
    2023/03/01
    2023/03/01
    2023/03/01
    2023/03/01
    2023/03/01
    2023/03/01
    2023/03/01
    2023/03/01
    2023/03/01
    2023/02/27
    2023/02/24
    2023/02/21
    2023/02/21
    2023/02/21
    2023/02/20
    2023/02/20
    2023/02/18
    2023/02/18
    2023/02/17
    2023/02/17
    2023/02/15
    2023/02/15
    2023/02/15
    2023/02/15
    2023/02/15
    2023/02/15
    2023/02/15
    2023/02/15
    2023/02/15
    2023/02/15
    2023/02/13
    2023/02/07
    2023/02/06
    2023/01/31
    2023/01/21
    2023/01/18
    2023/01/18
    2023/01/15
    2023/01/15
    2023/01/10
    2023/01/04
    2023/01/01

    * PNT = Satellite Positioning, Navigation and Timing Service, SLAS = Sub-meter Level Augmentation Service,
    DC Report = Satellite Report for Disaster and Crisis Management, CLAS = Centimeter Level Augmentation Service