1. A locating and map downloading system comprising: a personal digital communicator comprising: a display; a receiver for receiving GPS signals; a first transceiver; a first modem coupled to the transceiver and to a first digital processor; communicator input means for formatting a request for map information; the first digital processor providing a means for processing the GPS signals and determining therefrom the location of the communicator, for transmitting via the first modem and the first transceiver the request for map information, for displaying on the display map information responsive to the request, and for displaying on the display the communicator location with reference to the map information; and a map storage and transmitting device comprising a second transceiver, a second modem coupled to the second transceiver and a second digital processor, memory for storing map information in digital form, the second digital processor providing a means for determining which map information stored in the memory is responsive to the request and transmitting via the second modem and the second transceiver the map information responsive to the request, the map storage and transmittal device memory stores additionally stored data associated with discrete data points within the map information and such additionally stored data is transmitted with the responsive map information; a condition reporting device comprising: a processor; a computer memory storing information, the computer memory being accessible by the processor and containing at least location identification information; at least one weather condition sensor providing external information to the processor, the processor storing the external information in the computer memory; a vehicular traffic condition sensor providing vehicular traffic information to the processor, the processor storing the vehicular traffic information in the computer memory; and output means for transmitting information in the computer memory to the map storage and transmitting device; wherein the map storage and transmittal device receives the information transmitted by the condition reporting device via the second transceiver and the second modem and the second digital processor stores the information transmitted by the condition reporting device in the map storage and transmittal device memory; wherein the map storage and transmittal device stores the information transmitted by the condition reporting device as additionally stored data associated with discrete data points; wherein the first processor determines a route to a selected marker; and wherein the first processor transmits via the first modem and the first transceiver the location of the selected marker and a request for locations of condition reporting devices within a predefined distance of the selected marker.