GARMIN's new GPS III Plus offers cartographic capabilities formerly found only in high-end automotive navigation and marine chartplotting units. Simply plug it into a PC and download an extra 1.44 MB of map data from GARMIN's line of MapSource CD ROM's to give you instant detailed maps.

Whether you're cruising the streets or pounding the waves, GARMIN has the maps you need. Choose the "U.S. Roads and Recreation" CD for city street level detail and even inland marine features such as lake and river shorelines, boat ramp and marina locations. Other CD's give you worldwide coverage of coastlines, including a database of coastal cities, navaids and inland roads.

Even without additional cartography, the basemap in the GPS III Plus will get you where you're going. More than 10,000 new towns have been added to the permanent basemap, as well as airport locations, secondary roads in metro areas and even detailed exit information for the federal interstate highway system, including information about available lodging, food and service stations.

Unit Includes



Garmin GPS III Plus

Navigation Features


  • Total: 500 each with name, symbol, comment, and map display option
  • Nearest: 9 (automatic) continuously updated

Routes: 20 reversible routes with up to 30 waypoints each, plus MOB and TracBack modes

Track Log:
1900 points

Map Datums:

Lat/Lon, UTM/UPS, MGRS, Loran TDs, plus other grids, including Maidenhead and User Grid

Moving Map Features

Basemap: Built-in detailed Americas or Atlantic map to 20 miles (covers lakes, rivers, interstates, national/state highways, secondary roads in metro areas, cities, railroads, airports and a detailed exit database for the Federal Highway system), and is compatible with our MapSource product line

Map Scale:
Screen-width scale (500 feet to 3,000 miles)

GPS Performance

Receiver: Differential-ready 12 parallel channel receiver continuously tracks and uses up to twelve satellites to compute and update a position

Acquisition Times:

  • Warm: approx. 15 seconds
  • Cold: approx. 45 seconds
  • Autolocate: approx. 5 minutes
  • EZinit: easy initialization, 45 seconds

Update Rate: 1 second, continuous


  • Position:
    • 15 meters (49 feet) RMS*
    • 1-5 meters (3-15 feet) RMS with GARMIN GBR 21 DGPS receiver (optional)
  • Velocity: 0.1 knot RMS steady state

Dynamics: 6g's

Interfaces: NMEA 0183 and RTCM 104 DGPS corrections

Detachable with standard BNC connector



 2.32 H x 5 L x 1.62 W inches (5.9 x 12.7 x 4.1 cm)


 9 ounces (255g) w/ batteries


 2.2 W x 1.5 H inches (5.6 x 3.8 cm) high-contrast electroluminescent backlit FTN display; switchable orientation (100 x 160 pixels with gray scale)


 Internal lithium battery lasts up to 10 years



 10-32 VDC (4 AA batteries)


 0.75 watts

Battery Life

 Up to 36 hours

Specifications are subject to change without notice.

* Subject to accuracy degradation to 100m 2DRMS under the United States Department of Defense-imposed Selective Availability Program.

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