http://www.garmin.com/products/gpsmap76/# Americas Highway Basemap:
This basemap comes factory installed with the eMap, eTrex Legend, eTrex Vista, Nav Talk, Nav Talk Pilot, GPS III Plus, GPS 12MAP, GPSMAP 76, GPSMAP 76S, GPSMAP 176, GPSMAP 176C, GPSMAP 295, StreetPilot ColorMap, Rino 120 and Rino 130.
Please note: Garmin mapping units come with built-in, permanent basemaps that cannot be altered. These basemaps come in a variety of global designations (ie., Atlantic basemap). Please see your local dealer when purchasing a Garmin mapping unit to ensure that you purchase one with a basemap that's appropriate for your location and needs. Factory-installed basemaps cannot be altered.
The Americas Highway basemap includes the United States, Alaska, Canada, Mexico, and Central and South America, and covers an area from W180 to W30 Longitude, S60 to N75 Latitude. Also included is a high-level worldwide map with political boundaries and major cities.
The standard map coverage includes:
Oceans, rivers, and lakes (greater than 30 sq. miles)
Principal cities and many smaller cities and towns
Major interstates and principal highways
Political boundaries (state and international borders)
A. United States -In addition to the standard map coverage, it also includes:
Small lakes, major streams, and rivers
Railroads
National- and State-level roads
Many local roads in or near urban areas
More detailed coastline
Airports
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.
Tide Stations (certain units only)
B. Alaska - In addition to the standard map coverage, it also includes:
National- and State-level roads, plus some local roads in or near urban areas
Lakes greater than 5 square miles
Small cities and towns
Railroads
C. Canada - In addition to the standard map coverage, it also includes:
Lakes greater than 5 square miles (Southern Canada)
Lakes greater than 10 square miles (Central Canada)
Railroads