Magical device: a small device that makes it easy to build real-world navigation systems

Recently, much attention has been paid to research on real-world navigation systems. Although some real-world navigation systems have already been implemented, they have not been widely adopted, because they assume the use of a computer network system and are difficult to use for both providers and users. To solve this problem, we propose a small magical device based on an existing device called a PHS (Personal Handy-phone System). If providers and users use magical devices, they can use the real-world navigation systems easily and at low cost