The GPS 48 is available in six versions, each providing a high-level worldwide database of cities, and more detailed coverage for a specific geographic region. The Marine database comes pre-programmed in the GPS 48. Marine databases for the GPS 48 cannot be changed.

The standard worldwide database coverage for the Marine Database includes cities of populations of 200,000 or greater.

1. For a specific geographic region, more detailed database coverage for the Marine Databases includes a collection of nautical navaids that include the following:
   1. Racons
   2. Radio Beacons
   3. Fog Horns
   4. Day Beacons
   5. Lit and Unlit Navaids
2. Cities of all population

1. North America GPS 48 Part # 010-00144-00
   The North America Marine Database includes the United States, Alaska, Canada, northern most portion of Mexico, and the majority of the Caribbean, and covers the majority of W180 to W20 Longitude, 0 to N75 Latitude.
2. South America GPS 48 Part # 010-00144-01
   The South America Marine Database includes South America, Central America, Mexico, southern United States, and all of the Caribbean, and covers an area from W135 to W20 Longitude, S60 to N35 Latitude.
3. Europe GPS 48 Part # 010-00144-02
   The Europe Marine Database includes Europe, Iceland, extreme western Russia, Mediterranean, extreme northern Africa, and covers an area from W25 to E55 Longitude, N30 to N75 Latitude.
4. Africa GPS 48 Part # 010-00144-03
   The Africa Marine Database includes Africa, Madagascar, the Middle East, Mediterranean, and covers an area from W30 to E75 Longitude, S60 to N45 Latitude.
5. Asia GPS 48 Part # 010-00144-04
   The Asia Marine Database includes Asia (but excludes Southeast Asia), the Middle East, eastern Russia, China, Japan, and covers the majority of E55 to E180 Longitude, N5 to N75 Latitude.
6. South Pacific GPS 48 Part # 010-00144-05 The South Pacific Marine Database includes Australia, Polynesia, Indonesia, Southeast Asia, southern China, India, and covers an area from E65 to W135 Longitude, S60 to N30 Latitude.