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".
|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.
QZSS is operated in a 4-satellite constellation at present.
The operational status of each satellite 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.
NAQU Message 2020
* 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