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m →Water depth: this is a very strong statement that requires context and qualification |
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| url =http://www.oceangrafix.com/o.g/Charts/chartViewer.html?viewRegion=GreatLakes&viewChart=Lake-Huron
| access-date = 2008-05-22 }}</ref> A [[nautical chart]] will always explicitly indicate the units of depth used.{{dubious|this is a very strong statement that requires context and qualification}}
To measure the depth of shallow waters, boatmen used a [[sounding line]] containing fathom points, some marked and others in between, called ''deeps'', unmarked but estimated by the user.<ref>[http://www.navyandmarine.org/ondeck/1800soundinglead.htm Sounding lead.] By James Mathews. Navy & Marine Living History Association.</ref> Water near the coast and not too deep to be fathomed by a hand sounding line was referred to as ''in soundings'' or ''on soundings''.<ref>{{cite web|url=http://www.bruzelius.info/Nautica/Etymology/English/Burney(1901)_dict.html|title=Burney: "Vocabulary of Sea Terms", 1876.|website=www.bruzelius.info|access-date=21 March 2018}}</ref> The area offshore beyond the 100 fathom line, too deep to be fathomed by a hand sounding line, was referred to as ''out of soundings'' or ''off soundings''.<ref>[http://www.marinewaypoints.com/learn/glossary/glossary.shtml MarineWaypoints.com - Nautical Glossary.] SandyBay.net - Marine Directory (MarineWaypoints.com) and Reference Directory (StarDots.com).</ref> A ''deep-sea lead'', the heaviest of sounding leads, was used in water exceeding 100 fathoms in depth.<ref>[https://query.nytimes.com/gst/abstract.html?res=9D03EFDC1538E233A25755C0A9609C94639ED7CF The new way and the old; how the sounding machine has superseded the deep sea lead.] The New York Times, June 6, 1892, page 5.</ref>
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