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I'm looking for initiatives pursuing mobile offline trip planning using a combination of public transit data and walking-routes. Thus far, without much success.

Osmand, seems to be closest, but the part for offline tripplanning isn't completely funded yet. I may contribute, but haven't got a clue about its viability.

I'm looking for any projects pursuing this, or papers (comfortable with reading the academic math-stuff) outlining this. Also roadblocks preventing this (or rather: making quick implementation unlikely), etc. welcome of course.

I'm 'only' looking to do offline trip planning within one city at a time, which obviously brings down complexity lot.

P.S: adapted question from question posted on opentripplanner-forum: https://groups.google.com/forum/?fromgroups=#!topic/opentripplanner-users/m6PGVRBA0eU

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Are you looking for Open Source solutions or are commercial products (aka Nokia Maps API 'offline' mode) –  Mapperz Dec 14 '12 at 21:43
Looking for open source specifically –  Geert-Jan Dec 17 '12 at 14:08
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