Lowrance electronic 5150C - Manual (Page 39)

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Background map vs. MapCreate map content
The special built-in Lowrance background map contains basic world-
wide coverage of major inland lakes, rivers, streams and coastal wa-
ters, plus key cities, highways, and more.
MapCreate custom maps include massive amounts of information not
found in the background map. MapCreate maps contain 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 is 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
included in MapCreate.
NOTE:
Available through LEI Extras − look inside back cover for accessory
ordering information − FreedomMaps(TM) are pre-made maps that
contain all of the same information available in a custom MapCre-
ate map, without any of the work of preparation. FreedomMaps are
available for Europe and North America. Each chart is preloaded
on a plug and play digital memory card that you just install in your
GPS unit.