On Mobile Applications Based on Proximity

The article discusses mobile applications based on the concept of proximity. On the one hand, this can be considered as a special (private) class of geo-information systems, since we are talking about services (services) that are located in a certain geographically limited area. On the other hand, the abandonment of geo-computations and the use of special metrics for direct measurement of proximity opens up possibilities for completely new services that were not available in traditional models of geo-informatics. The paper discusses issues related to the measurement of proximity, new models of services and provides examples of specific implementations.