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NOAA releases six new chart overlays of Gulf of Mexico oil and gas lease blocks

New IENC overlay of lease blocks extends beyond the traditional chart coverage to include all lease blocks within the Gulf of Mexico.

NOAA has released six new chart overlays of the Gulf of Mexico oil and gas lease blocks. The overlays provide coverage that extends beyond the traditional lease block charts and includes all oil and gas lease blocks within the Gulf of Mexico.

An overlay is a map layer that can be superimposed on another map layer because they are registered to a common coordinate system. Overlays are used to show relationships between features that occupy the same geographic space. In the case of the lease block overlays, mariners are able to see the lease block boundaries relative to existing features depicted on the underlying electronic navigational charts (NOAA ENC®).

The overlays are compiled in the inland electronic navigational chart (IENC) format and require users to have an electronic chart display and information system  (ECDIS) or electronic chart system (ECS) that can ingest and display this specific format.

The lease block overlays were created from the Bureau of Ocean Energy Management Gulf of Mexico geographic mapping data (BOEM). The overlays do not constitute the legal boundaries of the official lease blocks and are for situational awareness only. The authoritative Gulf of Mexico oil and gas lease block boundaries can be found by reviewing BOEM's appropriate leasing map or official protraction diagram.

May 21, 2015

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