The best replacement for coordinates is cartesian coordinates.

The best alternatives to coordinates are rated as following:
★★★★★  cartesian coordinates
★★★★★  polar coordinates
★★★★★  rectangular coordinates
★★★★  latitude and longitude
★★★  coordinates
★★★  latitude longitude
★★★  surface coordinates
★★★  grid coordinates
★★★  ground coordinates
★★  longitude
★★  ordered pairs
★  state plane
★  cartesian
★  coordinate
  co-ordinates
  paper coordinates
  plane coordinates

Your alternative for coordinates is not listed? Suggest!
Speaking about coordinates, one probably shouldn't forget about google maps.

Other search terms related to coordinates and their ratings are:
★★★★★ google maps
★★ reflection
★★ grid
★★ algebra
★ map
google earth
addon
You have in mind a companion for coordinates and it is not yet here? Propose!



Google Trends

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coordinates
cartesian coordinates
polar coordinates