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  • Longitude refers to the X coordinates in ArcMap. 
  • They are represented on printed maps by vertical lines.  A simple mnemonic device for remembering this is "LONG is TALL."
  • Longitude will be displayed as either E (East) or W (West) on the eTrex.
  • In ArcMap, Southern latitude Western longitude values are indicated with a "-" (minus) sign.  In the eTrex unit, the minus sign is replaced with a "0" (zero)