1. Address lookups. Many of the buildings in OSM have yet to get street addresses added, so navigating to an address is a bit hit or miss. This gets fixed with time as people update the maps and wouldn't be a show stopper.
2. Real time traffic and detour navigation. This is really needed when navigating around busy cities where a wreck on a major highway can result in significant delays. This needs a combination of an external service (separate from OSM) but also one that has enough adoption to have usable data.
alt Hacker News
There are two things keeping me using "Big Map".
1. Address lookups. Many of the buildings in OSM have yet to get street addresses added, so navigating to an address is a bit hit or miss. This gets fixed with time as people update the maps and wouldn't be a show stopper.
2. Real time traffic and detour navigation. This is really needed when navigating around busy cities where a wreck on a major highway can result in significant delays. This needs a combination of an external service (separate from OSM) but also one that has enough adoption to have usable data.