for people asking me about my Garmin on my dashboard, i always tell them i bought it not for me but for my direction-challenged wifey.

Sine i had it about 1.5 years ago, i've updated roads to/from my own makati slice i.e. salcedo village: missing roads, turn restrictions, missing u-turn slots, no crossings and one-way streets...also eliminated better looking yet inaccurate for Garmin the corners of dual-carriageways meeting a single-carriageway road (know why? found out Garmin routing algorithm doesn't like turns...it looks for the primacy of roads but avoids turns and corners even if it's farther (garmin set to faster route, not shortest route). OSM shoudld depict such corners as a Y rather than a T or a cross.)

As i told wifey she won't get lost going to my office in Makati from Quezon City, the day came when she used my dear Sakura with her brother to fetch me.

I was wrong.

with OSM in had, she got lost that made me wonder why the so many times i've tested the route to my office with no glitches, even from different approaces and routes, except some portions where GPS signals affected by tall buildings.

Upon "interrogation" I found out she doesn't understand the numbers on the top left corner of Nuvi that indicates the distance before turning left or right while her brother is "scared" of the one-way streets of Makati and can't figure out the GPS instructions too.

Conclusion: it's just the usual USER_ERROR :P