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![Range markers theb4275.jpg Range markers](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_theb4275.jpg?itok=cxSAuWAN)
Description
Range markers. So long as the vessel stays somewhere inside of the linesprojected from the in-line markers, the vessel will stay in the safe channeluntil reaching a bend in the channel.
Location
Maine?
Collection
Historic Coast & Geodetic Survey