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Loran Lines on Penobscot Bay Chart
Document Type: Map/Chart
Geographic Location: Penobscot Bay, Maine
ID Number: Loran_Lines
Keywords: Navigation, Loran
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Description:
Many small scale charts provide Loran lines, which indicate the time difference expected between receipt of a master and slave radio signals. This chart, Penobscot Bay and Approaches, #13302 , has four different sets of lines, improving a navigator's chance of getting an accurate electronic fix. Loran receivers indicate by number which signals they are getting and the navigator finds the numbers and uses them to plot a fix. Modern Loran receivers read directly in latitude and longitude but the system has been made obsolescent by GPS.
This chart is at a scale of 1:80,000 and is good for planning a route up Penobscot Bay but does not show harbors and sections in the detail of a 1:40,000 harbor chart . The green bar shows the start of the main ship channel up to Searsport, and its beginning between Allen and Monhegan Islands is a spot that is easily found.
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