Map data is not "installed" in the unit ...
The unit reads the map data directly from the SD Card and overlays it onto the base background map ...when you remove the map card = no map data ...
Waypoints can still be marked (and used with navigation) without the map card in the unit ...because Nav data is written directly to the unit internal memory and then overlayed onto the base background map ...(you will basically see the blue dot waypoint on the base background map) ...
Waypoints written to the unit internal memory have to manually be "exported" to the SD Card thru the Waypoint Management menu system under the NAV tab in the Main Menu System ...
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The units with 1 SD Card slot are priced at a lower price point by the fact that some of the manufacturing costs can be cut by not having the 2nd SD Card reader hardware ...
Rickie


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