Technology can track a user's position to within 100 feet.
They receive radio signals from three or four satellites, then calculate the user's position; the devices do not send signals.
The Navman G.P.S. unit clips onto the back of the organizer, and its thick antenna receives signals from satellites that are used to calculate the user's position.
The company has acquired WiFiSlam, a start-up company that helps to improve the accuracy of indoor maps and other services by locating the user's position inside a building more accurately.
The ionospheric effects are related to the user's position.
A user's position does not change during one simulation run.
The user's position is randomly selected using (5) and (6).
"We are tracking the user's position very fast".
PDA user's position is computed with respect to VRML specification, synchronized with real indoor environment.
Finally, we will locate the user's position at the RP which has the maximum probability.
HD4AR does not need RF-based tracking technologies or inertial measurements to find a user's position.
