The IRMIS also provides for "automatic zooming," e.g., to show greater detail or closer detail as the user approaches a destination, or to larger scale and lower resolution to show the user's overall planned route between points of interest. The user can pan across maps and zoom between two or more map scales, levels of detail, or magnitudes. Audible signals identifying the next turn along the user's planned route are also provided. Used in the field, in conjunction with GPS receiver, the PDA device is configured to display directions, text and map formats, the user's current position, heading, speed, elevation, and so forth. Maps and related route information are configured with differential detail and levels of magnitude. Users' options include route information, area, and route maps. It optionally includes supplemental online information, preferably for transfer to the PDA or equivalent device. Desktop application facilitates user selection of areas, starts, stops, destinations, maps and/or point and/or route information. Such devices may be optionally equipped with, or connected to, portable Global Positioning System (GPS) or equivalent position sensing device. An Integrated Routing/Mapping Information System (IRMIS) links desktop personal computer cartographic applications to one or more handheld organizer, personal digital assistant (PDA) or "palmtop" devices.
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