Leslie. I updated my Nuvi Garmin before we headed down and still had a lot of problems. I have found that you cannot rely on it solely. I have gotten myself in many bad situations because I was believing the Garmin instead of a good Roja map.
It still is very handy especially if you use the exact latitude and longitude of the place you want to find ,it but the road system here in Mexico has has not been inputted at the same level as Can/Us and I think it is because of the lack of advertising revenue to Garmin here.
Take care. Breakfast at Esmeralds is great eh. They really have cleaned the place up. See you at the Tienges Manana.