Garmin mapping units come with built-in, permanent basemaps that cannot be altered. These basemaps come in a variety of global designations (i.e., Atlantic basemap). Factory-installed basemaps cannot be altered.

The Americas Routable basemap includes the United States, Alaska, Canada, Mexico, and Central and South America, and covers an area from W180 to W30 Longitude, S60 to N72 Latitude. Also included is a high-level worldwide map with political boundaries and major cities.

standard map coverage includes:

1. Oceans, rivers, and lakes (greater than 30 sq. miles)
2. Principal cities and a small amount of smaller cities and towns
3. Major interstates and principal highways
4. Political boundaries (state and international borders)
5. Railroads
6. Major Airports

A. United States - In addition to the standard map coverage, it also includes:

1. Small lakes, major streams, and rivers
2. Principal urban areas (including Alaska and Hawaii)
3. National- and State-level roads
4. Many local roads in or near urban areas
5. More detailed coastline
6. Airports
7. A database of exits for the Federal Interstate highway system. This includes many businesses within about ¼ mile of the exit, including: restaurants, diesel/gas, hotels/lodging, overnight RV parking, dumps, campgrounds, truckstops, medical facilities, shopping and outlet malls, ATMs, and many more attractions.
8. Tide stations

B. Alaska - In addition to the standard map coverage, it also includes:

1. National- and State-level roads, plus some local roads in or near urban areas
2. Lakes greater than 5 square miles
3. Small cities and towns
4. Tide stations

C. Canada - In addition to the standard map coverage, it also includes:

1. Lakes greater than 5 square miles (Southern Canada)
2. Lakes greater than 10 square miles (Central Canada)

D. Mexico, Central and South America

1. Standard Map Coverage