You searched for: Author I.M. Systems Group Remove constraint Author: I.M. Systems Group Access Public Remove constraint Access: Public Subject Oceans Remove constraint Subject: Oceans Subject Transportation Remove constraint Subject: Transportation Place Massachusetts Remove constraint Place: Massachusetts
2012. I.M. Systems Group. This point shapefile represents marine aids to navigation in the Northeastern United States. The Coast Guard maintains systems of marine aids to na... Coastal Services Center (U.S.).
2012. I.M. Systems Group. This polygon shapefile represents the geographic location and identity of designated areas used to manage vessel traffic in the northeast United St... United States. National Oceanic and Atmospheric Administration.