Click to visit NGA home. Click to visit NGA home.
Top portion of NGA banner. Clip image for NGA banner.
 
Search NGA:
Advanced Search
spacer
 Find...
Notice to Mariners
Publications
Broadcast Warnings
ONI Reports
ASAM Search
HYDROARC Reports
MODU Search
Product Catalog
Misc. Products
space
 Act...
Submit Report
Subscribe to NtM
Subscribe to BW
Take a Survey
space
 View...
Nautical Calculators
Geographic Locator
DNC Homepage
space
This is a U.S. Government system.  Before continuing, read this  disclaimer.
Problems? Contact NGA.
space
space
space
spacer
Frequently Asked Questions
spacer
spacer

How often is the data on the Web site updated?

Where are the Summary of Corrections publications?

What does it mean when a correction refers to "Subsection I-2"?

Why can't I print chartlets at the correct size?

How do I report a discrepancy?

Where can I get NGA charts and publications?

Why does my database query take so long?


How often is the data on the Web site updated?
The answer depends on the type of data...

Data associated with the Notice to Mariners (PDF files, correction databases, graphic correction files, etc.) is updated weekly, usually by Friday evening.

The Broadcast Warnings, Anti-Shipping Activity Messages (ASAM), and Mobile Offshore Drilling Units (MODU) databases are updated daily, usually before 1200 ET.

New editions of digital publications and updated publication files are uploaded as soon as they become available.




Where are the Summary of Corrections publications?
The Summary of Corrections are now posted to this site as PDF files. The download page is accessed from a hyperlink found on the Notice to Mariners page. Previous editions can be accessed via the Archives hyperlink.




What does it mean when a correction refers to "Subsection I-2"?
Subsection I-2 refers to that section of the Notice to Mariners publication where any associated graphic corrections appear. This Subsection is also referred to as the "Chartlets/Depth Tabulations/Notes" section.

To download associated graphic corrections using the Notice to Mariners database query form, change the "Notice to Mariners (NtM) Query:" list selection from "Chart Corrections" to "Chartlets/Depth Tabulations/Notes" and enter the appropriate chart number/NTM number information. 




Why can't I print chartlets at the correct size?
Select the Printing Instructions hyperlink on the Home page to view detailed instructions for printing graphic chart corrections (chartlets, depth tabulations, notes).




How do I report a discrepancy?
The "Marine Information Report and Suggestion Sheet" form included in each issue of the Notice to Mariners has long been used to submit discrepancies noted on NGA nautical products. The same form can now be submitted electronically from the Submit Reports section of this Web site.

Discrepancy information can also be submitted by e-mail to the site's Webmaster account at webmaster_nss@nga.mil.

Discrepancies noted on charts produced by NOAA should be sent directly to NOAA's Office of Coast Survey by completing their electronic Discrepancy Report form.



Where can I get NGA charts and publications?
For information about ordering NGA nautical products, visit the Product Catalog section of this Web site.



Why does my database query take so long?
Due to the high demand, our database server may occasionally become slow or unresponsive. Please be patient as your query request is being processed.

Certain database queries, by their very nature, will also require additional processing time. For instance:
- Queries "by Geographic Area" must search an entire database of coordinate data to locate the matching coordinates.
- Using the query option "All" will obviously require more processing time than using more specific product number or NTM number options.
Generally speaking, the more specific information that is provided when submitting a query to the database, the faster the response time will be.

spacer