The National Geospatial-Intelligence Agency advises that cancelled electronic navigational charts may cause unintended behavior on electronic chart display systems.

Original warning text

CANCELLED ELECTRONIC NAVIGATIONAL CHART (ENC)
ADVISORY.
USERS OF NGA ENC PRODUCTS ARE ADVISED OF
POTENTIAL UNINTENDED ECDIS BEHAVIOR WHEN
PROCESSING CANCELLED CHARTS, INCLUDING
REINSTALLATION OF RECENTLY CANCELLED CHARTS ON
SOME SYSTEMS WITHOUT OBVIOUS ERROR OR
WARNING MESSAGES.
NGA HAS CONFIRMED THIS ISSUE AFFECTS NAVY VMS 9.5 AND
RAYTHEON ANSCHUTZ SYNAPSIS NX SYSTEMS. THIS ISSUE DOES NOT
AFFECT NAVY ECDIS. OTHER SYSTEMS ARE CURRENTLY UNASSESSED.
USERS MAY REFERENCE NGA'S ENC CATALOG (GLOBAL
OR REGIONAL PRODUCT LISTINGS) FOR A LIST OF
CANCELLED CHARTS WHICH SHOULD BE UNINSTALLED
FROM ECDIS.
NGA'S GLOBAL ENC CATALOG IS AVAILABLE ON
HTTPS://MCDP.NGA.MIL, WITH REGIONAL ENC PRODUCT
LISTING SPREADSHEETS CONTAINED WITHIN EACH
REGION'S ZIP ON ESYNC, NGA'S WEBSITES, AND
WORLDCOVER DVD.
USERS MAY FILTER PRODUCT LISTINGS FOR EDITION OF
CXL AND SORT BY ISSUE DATE TO SEE MOST RECENT
CANCELLATIONS.
CHARTS CANCELLED WITHIN THE LAST 90 DAYS ARE
ACTIVELY DISSEMINATED BY NGA AND MOST LIKELY
CANDIDATES FOR INADVERTENT REINSTALLATION.
NGA IS CONSULTING WITH THE USER COMMUNITY TO
ASSESS POSSIBLE CHANGES TO THE CANCELLED CHART
DISSEMINATION PROCESS TO MITIGATE THIS POTENTIAL
UNINTENDED ECDIS BEHAVIOR.