US Navy electronic charts transition : DNCs to be replaced by ENCs

DNC data available on CD-ROM

From US Navy

UNCLASSIFIED// 
ROUTINE 
R 071418Z AUG 20 MID510001583052U 
FM CNO WASHINGTON DC 
TO NAVADMIN 
INFO CNO WASHINGTON DC 
BT 
UNCLAS 
 
NAVADMIN 221/20 
 
MSGID/NAVADMIN/CNO WASHINGTON DC/N2N6/AUG// 

 SUBJ/TRANSITION TO ELECTRONIC NAVIGATIONAL CHART// 
 
REF/A/PUB/IHO/1NOV00// 
REF/B/DOC/NATO/27SEP15// 
REF/C/PUB/NSG/1MAY20// 
REF/D/INST/OPNAV/30SEP19// 
 
NARR/REF A IS AN INTERNATIONAL HYDROGRAPHIC ORGANIZATION (IHO) PUBLICATION 
WHICH DESCRIBES THE ELECTRONIC NAVIGATIONAL CHART (ENC) S-57 FORMAT.   
REF B IS NORTH ATLANTIC TREATY ORGANIZATION (NATO) STANDARD AGEOP-19 DOCUMENT 
WHICH DESCRIBES AML FOR S-57 FORMAT.  
REF C IS NATIONAL SYSTEM FOR GEOSPATIAL INTELLIGENCE (NSG) FOUNDATION GEOINT 
(FG) INTELLIGENCE MISSION DATA PLAN PUBLICATION WHICH LISTS THE TYPES OF 
PRODUCTS NATIONAL GEOSPATIAL-INTELLIGENCE AGENCY (NGA) PLANS TO PRODUCE OVER 
THE NEXT FIVE YEARS.   
REF D IS OPNAVINST 9420.1C-POSITIONING, NAVIGATION AND TIMING POLICY WHICH 
DIRECTS TRANSITION FROM STANDARD NAUTICAL CHARTS TO ENC// 
POC/BUSHNELL/CAPT/OPNAV N2N6E4/TEL:  (571) 256-8231/ 
EMAIL:  JILLENE.BUSHNELL(AT)NAVY.MIL// 
POC/HANAFIN/CIV/OPNAV N2N6E4/TEL:  (571) 256-8227/ 
EMAIL:  CAROLINE.HANAFIN1(AT)NAVY.MIL// 
 
RMKS/1.  This NAVADMIN addresses the Navys discontinued use of the Digital Nautical Chart (DNC), the submarine specific product MATT, and Tactical Ocean 
Data (TOD) by fiscal year (FY) 2025 and its transition to the Electronic 
Navigational Chart (ENC) (using the IHO S-57 data format standard), Submarine 
ENC, and Additional Military Layers (AML).  The adoption of ENC enables the 
ability to create and display AMLs which overlay additional information on 
the navigation chart that is not available on paper or DNC. 
 
2.  With this transition, AML will replace TOD 0, TOD 4, and anti-submarine 
warfare (ASW) bathymetry products.  NGA will release limited coverage of ENC, 
SMENC, and AML in FY20 and complete global coverage by FY24. 
 
3.  Ships equipped with ENC-approved Electronic Chart Display and Information 
System (ECDIS) software shall use ENC where and when available, and continue 
to use DNC where and when ENC is not available.  Navy programs relying on DNC 
for navigational or non-navigational purposes shall plan for DNC termination 
in FY25. 
 
4.  The AML data layer requirements are currently being generated and will 
include (not all-inclusive) contour line bathymetry; environment, seabed and 
beach; large bottom objects; maritime foundation and facilities; routes, 
areas, and limits; and small bottom objects.  Commands should submit 
additional requirements for any other desired information and unmet data 
display needs as AML requirements to their Type Commander. 
 
5.  Released by VADM Jeffrey E. Trussler, Deputy Chief of Naval Operations 
for Information Warfare, OPNAV N2N6.// 
 
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UNCLASSIFIED//

Links :

• IHO : a review of the reliationship of the ENC and DNC hydrographic vector data products
• NIMA/NGA : US Navy Spatial Data (2002)
• GeoGarage : Google Earth (kmz weekly updated file) of the worldwide ENC catalogue
• GeoGarage blog : USS Guardian probe report evades key issues, raises more questions / Digital map error may have led to minesweeper grounding