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    A good reason to know celestial navigation
    From: Doug Faunt
    Date: 2020 Sep 22, 12:09 -0700

    From the USCG:
    Threat Type: GPS Interference
    Geographic Area: Various
    This revised advisory cancels U.S. Maritime Advisory 2020-007
    1. Reference: None.
    2. Issue: Multiple instances of significant GPS interference have been
    reported worldwide in the maritime domain. This interference is
    resulting in lost or inaccurate GPS signals affecting bridge
    navigation, GPS-based timing, and communications equipment. Satellite
    communications equipment may also be impacted. Over the last year,
    areas from which multiple instances have been reported include the
    eastern and central Mediterranean Sea, the Persian Gulf, and multiple
    Chinese ports. The U.S. Transportation Command “Message for Industry”
    at https://go.usa.gov/xdSpq provides additional GPS interference
    3. Guidance: Exercise caution when operating underway and prior to
    getting underway. The U.S. Coast Guard Navigation Center (NAVCEN) and
    NATO Shipping Center websites contain information regarding effective
    navigation practices for vessels experiencing GPS disruption. The
    information reaffirms safe navigation practices when experiencing GPS
    disruptions, provides useful details on reporting disruptions, and is
    intended to generate further discussion within the maritime community
    about other disruption mitigation practices and procedures. This
    guidance also recommends reporting such incidents in real time; noting
    critical information such as the location (latitude/longitude), date,
    time, and duration of the outage/disruption; and providing photographs
    or screen shots of equipment failures experienced to facilitate
    analysis. The NAVCEN information is available at:
    best, doug

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