The Atlas includes street-level mapping for 44 cities in Mexico (see a complete list below) including San Miguel de Allende and Puerto Vallarta.  The Highways have been updated to 2007 data.  The full product sells for $190 (a 180 MB download).  Individual Regions of the Baja Expeditioner, Northeast, Central Mexico, Western, Copper Canyon, Isthmus, and Mayan Riviera are $95 (HERE).

Street Search in Mexico:
The address system in Mexico is different in some aspects to the one used in the USA. The Garmin receivers use the American system and some adaptations for street search were made to work better.  BiciMapas is working on a detailed visual aid to do street search which they will publish soon.  Meanwhile use this general procedure based on your GPS receiver model:

nuvi and StreetPilots:
1. Click "Address"
2.  Select "Mexico" when asked for the country
3.  Select "Search all"
4. When asked for the number, enter any number as the data base does not include house numbering yet.
5. All the choices with that name will show. Select the street you are looking for based on the city being searched.

Handheld models (series 60, 76, Quest, Etrex, etc)
1. Select "Address"
2. Enter a house number. Any number, as our data base does not include house numbering yet
3. Enter the street name and select the one you are looking for from the list.
4. All the options with that name will show. Select the one you are looking for based on the city.

PURCHASE:
In order to purchase the maps, you will need to give the vendor your unit internal ID number and verify that you have either MapSource or Trip & Waypoint Manager (obtainable from the vendor).  Then you will receive a receipt, a download link, and an unlock code for the map.

NOTES:
1. The Mexico GPS Atlas maps require a MapSource map or MapSource Trip & Waypoint Manager (around $30) to load the maps into your GPS receiver.  If you have a receiver that does not come with a DVD of a MapSource map, you will need this additional software.  Some units  with pre-installed maps come without a DVD of the maps,  such as a Nuvi or the StreetPilot cXXX series.  However,  customers with US (only) maps can request that Garmin send them a DVD copy of their installed map which will include the MapSource program.
2. With the BiciMapas maps, you have a map that can also be displayed on MapSource (along with your GPS data) -unlike the Garmin Mexico NT maps, which cannot be shown on a PC screen.
3. In this review we do not have any recorded GPS data to show on the Detailed Coverage areas of the Garmin Mexico maps.

AUTOROUTING:
The Atlas now has an auto routing and navigation feature in highways, streets, unpaved roads, double and single lanes.
There are more than 280,000 towns and rural locations, over 45,000 points of interest database including, geographical features such as beaches, mountains, lakes, dams, rivers, and so forth.  Also, urban points of interest such as hospitals,
government buildings, shopping centers, and over 1500 gas stations along the Mexican Highways network.
The maps contain International and state boundaries, lakes, rivers, and national parks.

TOPOGRAPHIC:
Contours are provided at 50 meter (164 Ft) intervals for the Baja Peninsula and 100 meter (328 Ft) intervals for the remainder of the country.

City Coverage:
Baja California-Mexicali, Tijuana, Tecate, Rosarito, San Felipe, Ensenada Baja California Sur-Constitución, San José del Cabo, Cabo San Lucas, La Paz.
Campeche-Campeche, Coahuila-Torreón, Chihuahua-Chihuahua Distrito Federal-Ciudad de México.
Durango-Cd. Lerdo, Gomez Palacios.
Guanajuato-Guanajuato, León, San Miguel de Allende.
Guerrero-Acapulco.
Hidalgo-Pachuca.
Jalisco-Guadalajara, Puerto Vallarta.
Morelos-Cuernavaca, Jiutepec.
México-Atizapán, Tlalnepantla, Naucalpan, Huixquilican, Ecatepec,
Nezahualcoyotl, Cuautitlán, Cuautitlan Izcalli, Tultitlan, Coacalco,
Toluca, Valle de Bravo.
Nuevo León-Monterrey.
Oaxaca-Oaxaca.
Puebla-Puebla, San Andrés Cholula, San Pedro Cholula.
Querétaro-Querétaro.
Quintana Roo-Cancun, Cozumel, Playa del Carmen, Chetumal.
San Luis Potosí-San Luis Potosí.
Sinaloa-Mazatlán.
Sonora-Hermosillo, Puerto Peñasco.
Tabasco-Villahermosa.
Veracruz-Veracruz.
Yucatán-Mérida.

This map will automatically create point-to-point routes on compatible Garmin GPS units and contains motorways, national and regional thoroughfares and local roads including turn restrictions and speed categories.

A web site of our complete Mexico trip in 2002 can be found (HERE).