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map data just shows where the roads are. Turn by Turn data shows which roads are one way, which side of the road the exit for that interstate is, and other such
by zaphar 17y ago
map data just shows where the roads are. Turn by Turn data shows which roads are one way, which side of the road the exit for that interstate is, and other such detail that you would need to know besides just the lines on the map.
- jrockway 17y agoBut Google Maps has had that data for years.
- jrockway 17y agoBut Google Maps has had that data for years. I assume they just signed something saying they wouldn't use that data for turn-by-turn navigation. (Remember, Google Maps has had driving directions forever. It just showed you all the turns at once, instead of as you were driving.)
- spc476 17y agoIt isn't 100% accurate though. For instance, these driving directions: http://maps.google.com/maps?f=d&source=s_d&saddr=NW+51st+St&daddr=26.390832,-80.087961&hl=en&geocode=FTC_kgEd3OQ5-w%3B&mra=dme&mrcr=0&mrsp=1&sz=17&sll=26.393129,-80.090553&sspn=0.007208,0.007242&ie=UTF8&ll=26.392869,-80.089978&spn=0.007208,0.007242&z=17 http://maps.google.com/maps?f=d&source=s_d&saddr=NW+... are not correct. While 4th Ave is bi-directional, the segment between NW 51st St and NW 50th Pl is one way, north only (towards NW 51st St). I don't know if other GPS systems get this correct or not (I don't have a GPS system to check).
- zaphar 17y agoI'm assuming that's true. Using the data they had from a third-party for turn-by-turn would have cost them extra. Thus the decision to build their own.