First I went to Mexico Mike's site and read what he had to say. To paraphrase he says buy Garmin they are using Bicimapas and they are the best.
I also posted on Mexicoconnect travel forum where I got two great answers. One says " our two trips this year covered over 5000 miles and for the first time ever, I never had to pull out the Guia Roji Mexico map book for clarification" The other says Garmin routing is better than the Bicimapas is.
Then I telephoned to order my Atlas de las Carreteras de Mexico 2015 from www.mexicomaps.com and talked for an hour or more with a very knowledgeable sounding guy about GPS and Mexico maps. He was enthusiastic about bicimapas and about Garmin. Then I called Garmin support and had a long talk with them. Again the guy sounded knowledgeable. He confirmed the answers I got about the coverage and lots more about the difference in different Garmin models.
The long and short of the story is that if you have a Garmin but not Mexico coverage they sell a microSD chip which is basically the bicimapas for $50. However their GPS (at least for 2013 and 2014) that have the North America map including Canada, USA, and Mexico now have the bicimapas data included exactly the same as the microSD for Mexico. Topo not included.
Supposedly in addition to major highways you get all the little roads and small towns. All the gas stations, lots of restaurants, other types of stores. detailed maps of many many cities, improving on routing through one way streets.
I bought a Garmin nuvi 2699LMT-HD 6" Touchscreen GPS from Costco online. I can return it if I am not happy with it.
I am driving to La Manzanilla in early December. Feel free to email me after that with questions if you wish.
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