Finally , the till receipt can be transferred to the jacket to update the shopping list and personal accounts. Our pinger design shown in Figure 1 uses radio frequency to eliminate the need for line of sight contact. In a similar way the Spatial Reminder provides location specific reminders that are triggered by the location of the wearable computer. The use of GPS provides an international outdoor positioning system with an accuracy approaching a few meters, but once the receiver enters a building of any significant size the GPS signal is lost and the receiver can no longer provide the information needed to locate the user. In The First International Symposium on Wearable Computing, 1997.
Wearable computers offer a rich and new research field for computer human interaction.
Symp. on Wearable Computers, 1997. 6.1.5 Location awareness via the Position Server A Position Server, developed by John Holmes in the Speech Group, provides position and activity data. Starner, Thad and Dana Kirsch. Proceedings of the International Symposium on Wearable Computing, IEEE, October 1997. Another approach to acquire context information is to make the environment smart, so that it can supply context information to mobile devices and applications.