Grab uses openstreetmap, unfortunately, I don't see them contributing back. Grab maps probably is another alternative if you are in metro manila

Is this due to lacking underlying OpenMaps data?

Yes. If Comaps is your primary navigation app, I recommend also contributing missing locations in Openstreetmap itself. I typically add locations I go to if there isn't one yet (after using a secondary navigation app). Comaps is pretty awesome and I use it whenever I don't need live traffic.

Hi! Not trying to hijak your post, but speaking of maps, is google maps the “best” in the philippines, and will apple maps never catch up?

What is comaps? Is there an app for that?