OSM is updated daily if you want to download the daily updates...
if the map is wrong, you can correct it yourself then download the updated map the following day or after 2 days...
check out routing of roadguide vs OSM... particularly in Makati and QC :P

for now, suggest you use both RG and OSM...and before hitting the road, check the best route first and don't depend too much on your GPS, you can simulate the route too before going