The U.S. Coast Guard is seeking public input on proposed changes to buoy placement in Maine waters as its works to modernize its system of navigational aids across the Northeast.

The Coast Guard previously announced in April that it would be removing more than 300 buoys in New England, prompting confusion and concern among mariners.

U.S. Sens. Angus King and Susan Collins, along with eight of their fellow coastal New England senators, wrote a letter to acting Coast Guard Commandant Kevin Lunday in June calling for the agency to hold off on the changes.

The Coast Guard said last month that it would pause and adjust its plan. It announced Saturday that it is reopening public comment through Nov. 15.

As a result of earlier feedback, the Coast Guard has already revised plans for more than half of the buoys included in the original proposal. Some were removed from the proposed discontinuation while others remain slated for discontinuation, though in some cases with changes proposed for nearby buoys.

The buoys serve various purposes, such as marking harbor entrances and coastal hazards. The agency has said its goal is to modernize and rightsize the setup, as many of the buoys were deployed before modern GPS systems.

“The (proposal’s) main objectives remain to ensure long-term buoy system sustainability at the most navigationally critical locations for mariners while better understanding how navigation practices are changing through tools like GPS location, radar, AIS, electronic charts, and navigation apps,” the Coast Guard said in a written statement Saturday. “The (proposal) update seeks to balance the use of physical aids with other navigation tools.”

The Coast Guard is asking for feedback before Nov. 15 and is requesting that mariners include their size and type of vessel, how the buoys are used and the distance at which they start looking for and using the buoys. Responses may be submitted via email to [email protected].

A map of the proposed changes can be found at www.bit.ly/BuoyProposal.