Method, System and Apparatus for Navigational Assistance

A mobile computing device for navigational assistance in a facility having a global frame of reference, the mobile computing device comprising:

• a memory storing:
• an anchor definition containing (i) an anchor position in the global frame of reference, and (ii) a feature set corresponding to physical characteristics of the facility at the anchor position;
• and
• a task definition containing (i) a task position defined relative to the anchor position, and (ii) task overlay data;
• a display;
• an image capture module configured to capture a sequence of images;
• a processor connected to the memory, the display and the image capture module, the processor configured to:
• in a global navigation mode, determine a global device position in the global frame of reference;
• responsive to detecting the feature set of the anchor definition in the sequence of images, switch from the global navigation mode to a local navigation mode by determining a local device position of the mobile computing device relative to the anchor position;
• based on the local device position and the task position, determine whether the task position is within a field of view of the mobile computing device;
• and
• responsive to determining that the task position is within the field of view, control the display to present the sequence of images overlaid with the task overlay data on a display.