Lowrance electronic AirMap 2000C - Manual (Page 40)

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Map Pages with high-detail map of an urban area loaded on the MMC,
with the Earth Map Detail option set to Medium, the default. At left,
arterial streets appear at the 5 nautical mile zoom range. Center, at 1.5
nautical miles, minor streets appear, along with square dots represent-
ing Points of Interest. Right, at the 0.4 nautical mile zoom, you can see
major and minor streets as well as Point of Interest icons for a hotel
and a grocery store.
Background map vs. MapCreate map content
The background map includes: low-detail maps of the whole world (con-
taining cities, major lakes, major rivers, political boundaries); and me-
dium-detail maps of the United States.
The medium-detail U.S. maps contain: all incorporated cities; county
boundaries; some major city streets; Interstate, U.S. and state highways;
Interstate highway exits and exit services information; large- and me-
dium-sized lakes and streams; and more than 60,000 navigation aids and
10,000 wrecks and obstructions in U.S. coastal and Great Lakes waters.
MapCreate custom maps include massive amounts of information not
found in the background map. MapCreate contains: the searchable
Points of Interest database, all the minor roads and streets, all the
landmark features (such as summits, schools, radio towers, etc.); more
rivers, streams, smaller lakes and ponds and their names.
What's more important is the large scale map detail that allows your
GPS unit to show a higher level of position accuracy. For example, the
background map would show you the general outline and approximate
shape of a coastline or water body, but the higher detail in MapCreate
shows the shoreline completely and accurately (finer detail). Many
smaller islands would not be included in the background map, but are,
of course, in MapCreate.