Methods and apparatus for geo-collaboration

A computer readable medium whose contents cause a first computer to share a geographical location on a map with a second computer, by performing the steps of:

• retrieving the geographical location to the first computer;
• adding the geographical location to a first map file having a plurality of layers, the first map file being rendered at the first computer;
• sending the geographical location to the second computer;
• aggregating the geographical location into a second map file at the second computer;
• and
• rendering the second map file including the geographical location at the second computer.

A method for co-navigating a map between first and second computers, comprising:

• displaying a first map file having a plurality of layers from a map perspective at the first computer, the map perspective describing position, orientation and zoom level of the displayed first map file;
• sending the map perspective being displayed at the first computer to the second computer;
• and
• rendering, at the second computer, a second map file from the same map perspective being displayed at the first computer.

A computer readable medium whose contents cause a first computer to lead a co-navigation session of a map with a second computer, by performing the steps of:

• displaying a first map file having a plurality of layers from a map perspective at the first computer, the map perspective describing position, orientation and zoom level of the displayed first map file;
• sending the map perspective being displayed at the first computer to the second computer;
• and
• rendering, at the second computer, a second map file from the same map perspective being displayed at the first computer.