Method and apparatus for identifying geographic locations

A navigation device, comprising:

• a display screen for providing navigation information to a user;
• and
• a processor communicably coupled to a data store comprising a context table, wherein the context table comprises:
• a context identifier associated with a geographic region;
• information identifying a location of a firstly plurality of cells dividing at least a part of the geographic region, each cell being associated with a unique identifier of a first length;
• and
• information identifying a location of a second plurality of cells dividing one portions of the geographic region, each cell being associated with a unique identifier of a second length,
• wherein geographic locations within the second plurality of cells are uniquely identified by identifiers of the first and second lengths, and
• wherein the processor is arranged to receive, from a user, at least one identifier, and to determine at least one geographic location corresponding to the respective identifier from the context table.

A computer-implemented method, comprising:

• receiving, from a user, at least one identifier;
• accessing a data store comprising a context table, wherein the context table comprises:
• a context identifier associated with a geographic region;
• information identifying a location of a firstly plurality of cells dividing at least a part of the geographic region, each cell being associated with a unique identifier of a first length;
• and
• information identifying a location of a second plurality of cells dividing one portions of the geographic region, each cell being associated with a unique identifier of a second length,
• wherein geographic locations within the second plurality of cells are uniquely identified by identifiers of the first and second lengths;
• and
• determining at least one geographic location corresponding to the respective identifier from the context table.