Wireless Local Messaging System and Method of Determining a Position of a Navigation Receiver Within a Wireless Local Messaging System

The wireless local messaging system according to 11, wherein the system is integrated in a global navigation satellite system having at least one group of navigation satellites configured to transmit navigation information to the at least one navigation receiver.

A method of determining a position of a navigation receiver within a wireless local messaging system, the method comprising:

• transmitting, by a plurality of local transmitters, local messages that include local position information of the plurality of local transmitters;
• receiving, by the navigation receiver, the local messages from at least one of the plurality of local transmitters,
• determining, by the navigation receiver, its position using the received local messages or local position information received from a database when no navigation information is received from a group of navigation satellites or when navigation information received from the group of navigation satellites does not allow determination of the position of the navigation receiver, wherein the received local messages or the local position information is position data.

A navigation receiver adapted to:

• receive and process a local PRN code containing a local message from at least one of a plurality of local transmitters,
• determine its position using the received local messages or local position information received from a database when no navigation information is received from a group of navigation satellites or when navigation information received from the group of navigation satellites does not allow determination of the position of the navigation receiver, wherein the received local messages or the local position information is position data.