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The number in the series that is the most often used. Ex: 3,4,5,6,7,7,7,8,9 7 is the mode, because it appears 3 times, when the other numbers only appear once.
The series number on a military map usually appears in the upper right margin. It is a sequence reference expressed either as a four-digit numeral (1125) or as a letter, followed by a three- or four-digit numeral (M661, T7110).
The series number on a map is located on the top right hand corner.
A map reference indicating a location in terms of a series of vertical and horizontal grid lines identified by numbers or letters.
Sequential numbers appear sometimes on channel buoys