nagivator
n.— «After digging around the Amazing Race web site, I discovered that the crew calls the person who sits in the backseat with the map the “nagivator” because they’re constantly nagging the driver. Heh.» —“Amazing Race insider slang” by Eric Lindholm Viking Pundit (Mass.) Jan. 16, 2005. (source: Double-Tongued Dictionary)
Further reading
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