The OSM map is indeed routable. Just downloaded the latest and checked. I even find that it has more details as compared to roadguide.ph 2.07 as far as the Mindanao area is concerned. Maybe 2.08 (or the latest) has been updated but I wouldn't know as I am not a contributor and can't download their maps.
After further testing, OSM cannot route properly if your route involves a ferry ride. In this case OSM just connects your origin and destination waypoints in a straight line (with roads not routed). Roadguide 2.07, however routes it properly taking into account the shortest ferry routes.
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