Mapping system

A method of storing map data on a non-volatile storage device, the method comprising:

• extracting secure identification data from a non-volatile storage device storing secure identification data;
• dispatching said secure identification data together with a request identifying an item of map data to a remote server;
• generating, at said remote server, in response to receipt of secure identification data and a request identifying an item of map data:
• encrypted map data corresponding to a requested item of map data;
• and
• signature data generated using said encrypted map data, a private encryption key and said received secure identification data;
• and
• storing said encrypted map data and said signature data on said non-volatile storage device.

A mapping system comprising:

• a mapping module operable to process a determined current position for the mapping system and select map data for display;
• a display screen operable to display an image corresponding to selected map data selected by said mapping module;
• means for extracting secure identification data from a non-volatile storage device storing secure identification data and dispatching said secure identification data together with a request identifying an item of map data to a remote server;
• and
• means responsive to a request to decrypt encrypted map data stored on a digital card to:
• extract secure identification data from a non-volatile storage device storing encrypted map data and signature data;
• utilise a public key to determine data utilized together with a private encryption key and stored encrypted map data to generate the stored signature data;
• and
• decrypt said encrypted map data stored on a non-volatile storage device only if the secure identification data on a non-volatile storage device corresponds to data utilised to generate said stored signature data using said encrypted map data and said private encryption key.

A mapping system comprising:

• a positioning module operable to receive positioning signals and determine a current position for the mapping system;
• a map store storing map data defining a raster image of a map;
• a mapping module operable to process a determined current position for the mapping system and select map data for display;
• a display screen operable to display an image corresponding to selected map data selected by said mapping module;
• and
• a compass module operable to determine the current orientation of said mapping system, wherein said mapping module is operable to process map data so as to generate display data wherein displayed map data is orientated on said display screen in an orientation selected on the basis of a current orientation determined by said compass module.

A mapping system comprising:

• a first data store operable to store map data;
• a second data store;
• a mapping module operable to generate display data utilising data stored in said second data store;
• and
• a user interface operable to enable a user to select a location, wherein said second data store is operable to store map data for an area greater than the area for which said mapping module is operable to generate display data, said mapping system being arranged so that said mapping module is operable to generate display data illustrating a scrolling map based on data stored in said second data store wherein the speed of scrolling is selected so that said speed does not exceed the speed with which data stored in said first data store can be transferred from said first data store to said second data store.

A mapping system comprising:

• a positioning module operable to receive positioning signals and determine a current position for the mapping system;
• a mapping module operable to process a determined current position for the mapping system and select map data for display on the basis of said determination;
• a display screen operable to display an image corresponding to selected map data selected by said mapping module,
• a first map store operable to store data defining an image of a map for display on the display screen;
• and
• a second map store operable to store data associating locations with label data,
• wherein said mapping module is operable to select map data for display by selecting a portion of an image of a map from data stored in said first map store and combining said image data with label data for areas illustrated by said selected portion of image data associated with label data stored in said second map store.