Inland Electronic Navigational Charts

The Inland Electronic Navigational Charts (IENC) dataset is updated bi-monthly by the US Army Corps (USACE)/Army Geospatial Center (AGC), and part of U.S. Department of Transportation (USDOT)/Bureau of Transportation Statistics (BTS) National Transportation Atlas Database (NTAD). There is a partial delivery on the 1st and 15th business day of a month. If there is a need for a special chart delivery, occasionally there will be updates outside of the delivery cycle. The charts with data changes are released either as new editions or updates to existing IENCs on a regular delivery cycle. These IENCs were developed from available data used in maintenance of Navigation channels. These vector data, that make up the charts, can be downloaded as a geodatabase here: https://ienccloud.us/ienc/products/files/U37/ienc_master_dataset_gdb/USACE_IENC_Master_Service_gdb.zip. In addition, web mapping services of the feature classes/datasets can be found here: https://ienccloud.us/arcgis/rest/services/IENC_Feature_Classes. Users of these IENCs should be aware that some features and attribute information could have significant inaccuracies due to changing waterway conditions, inaccurate source data, or approximations introduced during chart compilation. Caution is urged in use of these IENCs or derived products for navigation planning or operation, or any decisions pertaining to or affecting safety of vessel operation. Only charts downloaded from the USACE chart server, https://ienccloud.us, and used in an Electronic Chart Display Information System (ECDIS) or Electronic Chart System (ECS), or official government chart books are suitable for navigation.

Data and Resources

Field Value
access_constraints ["Access Constraints: unrestricted"]
bbox-east-long -79.4655559999999
bbox-north-lat 45.142195
bbox-south-lat 29.610281
bbox-west-long -96.7379979999999
contact-email Dale.K.Dodson@usace.army.mil
coupled-resource []
dataset-reference-date [{"type": "creation", "value": "2020-07-01"}]
guid Inland Electronic Navigational Charts
licence ["This NTAD dataset is a work of the United States government as defined in 17 U.S.C. \u00c2\u00a7 101 and as such are not protected by any U.S. copyrights.\u00c2\u00a0This work is available for unrestricted public use. Users should be aware that the IENCs reflect best available information at the time the data was collected. These data products are subject to change."]
metadata-date 2025-07-23
metadata-language eng; USA
metadata_type geospatial
old-spatial {"type": "Polygon", "coordinates": [[[-96.7379979999999, 29.610281], [-79.4655559999999, 29.610281], [-79.4655559999999, 45.142195], [-96.7379979999999, 45.142195], [-96.7379979999999, 29.610281]]]}
progress onGoing
resource-type series
responsible-party [{"name": "United States Army Corp of Engineers (USACE)", "roles": ["pointOfContact"]}]
spatial {"type": "Polygon", "coordinates": [[[-96.7379979999999, 29.610281], [-79.4655559999999, 29.610281], [-79.4655559999999, 45.142195], [-96.7379979999999, 45.142195], [-96.7379979999999, 29.610281]]]}
spatial_harvester true
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • AmeriGEO
  • AmeriGEOSS
  • CKAN
  • GEO
  • GEOSS
  • National
  • North America
  • United States
  • agc
  • army geospatial center
  • atlas
  • charts
  • coast guard
  • continental united states
  • database
  • electronic
  • hifld
  • ienc
  • inland electronic navigational charts
  • marine
  • maritime
  • national
  • national geospatial data asset
  • national transportation atlas database
  • navigational
  • ngda
  • ngdaid150
  • ntad
  • s inland enc 2.3.6
  • s-57
  • transportation
  • transportation infrastructure
  • transportation theme
  • us inland enc
  • usa
  • usace
  • uscg
  • vector
isopen False
metadata_created 2025-09-24T10:13:02.468420
metadata_modified 2025-09-24T10:13:02.468430
notes The Inland Electronic Navigational Charts (IENC) dataset is updated bi-monthly by the US Army Corps (USACE)/Army Geospatial Center (AGC), and part of U.S. Department of Transportation (USDOT)/Bureau of Transportation Statistics (BTS) National Transportation Atlas Database (NTAD). There is a partial delivery on the 1st and 15th business day of a month. If there is a need for a special chart delivery, occasionally there will be updates outside of the delivery cycle. The charts with data changes are released either as new editions or updates to existing IENCs on a regular delivery cycle. These IENCs were developed from available data used in maintenance of Navigation channels. These vector data, that make up the charts, can be downloaded as a geodatabase here: https://ienccloud.us/ienc/products/files/U37/ienc_master_dataset_gdb/USACE_IENC_Master_Service_gdb.zip. In addition, web mapping services of the feature classes/datasets can be found here: https://ienccloud.us/arcgis/rest/services/IENC_Feature_Classes. Users of these IENCs should be aware that some features and attribute information could have significant inaccuracies due to changing waterway conditions, inaccurate source data, or approximations introduced during chart compilation. Caution is urged in use of these IENCs or derived products for navigation planning or operation, or any decisions pertaining to or affecting safety of vessel operation. Only charts downloaded from the USACE chart server, https://ienccloud.us, and used in an Electronic Chart Display Information System (ECDIS) or Electronic Chart System (ECS), or official government chart books are suitable for navigation.
num_resources 2
num_tags 38
title Inland Electronic Navigational Charts