General:
The Garmin City Navigator Mexico NT 2008 comes on a (micro)SD Card (with an SD adapter) or CD, and is about $110.  Check for latest discount prices (HERE).  The Garmin maps are much improved over their former City Select Mexico NT map with 131,000 KB of data as compared to 12,689KB in the earlier version. The microSD card will apparently work on any Garmin unit that supports either an SD or microSD card and do not require an unlock code.  For this review we used a Garmin nuvi 760 for the screen shots.  PC Screen captures were used for the Mexico GPS Atlas maps, since they can be downloaded to MapSource.

Both the Garmin and BiciMapas maps will autoroute.  Garmin's Mexico NT 2008 maps have detailed coverage of all the cities in Mexico we checked.  These maps include points of interest for: food and drink, lodging, attractions, entertainment, shopping, emergency services and more.  These maps will automatically create point-to-point routes on compatible Garmin GPS units.

At present, the Garmin maps now have more street detail than the BiciMapas maps.  However, BiciMapas maps include contour lines (check the Copper Canyon below).  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.  The Garmin City Navigator Mexico NT maps are not compatible with all Garmin units, such as the 2610, Quest, 60C, 76C, etc.  The BiciMapas map should be compatible with these units.  To see a review of the original Garmin City Select Mexico NT maps as compared to BiciMapas Mexico GPS Atlas v1, click (HERE).

Individual Regions of the Baja Expeditioner, Northeast, Central Mexico, Western, Copper Canyon, Isthmus, and Mayan Riviera on SD cards are $120.  However, check this (LINK) where you will find "View Detail".  Under each View Detail will be the $95 price of the download version of the region of interest.
Both downloads and SD cards require an unlock code.  Unlike the Garmin SD cards, one must obtain unlock codes for the Atlas cards, and these cards cannot be used on more than one unit.

New Features:
Added street detail for the remainig  13 State Capital Cities
Added street detail for San Luis Rio Colorado in Sonora as well as Batopilas and Urique in Chihuahua
Added the trails equivalent to the Exploration Maps Series.  Also in these areas were added contours at a 20 meter interval.
Added new Points of Interest (Restaurants, Gas Stations, Hotels, Banks) to several cities. Updated the highways tool booths.
Simplified the street search process.  Improved the search for airports, bus stations and POIs in general.
Improved major city names visualization.  Modified contour lines rendering to prevent screen clutter. Contours show at lower zoom ranges.
Updated the highway network. New map file organization to ease identifying the components of each region.

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.
Added the trails equivalent to the Exploration Maps Series.  Also in these areas were added contours at a 20 meter interval.

City Coverage (68 cities including):
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.

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