This paper reports on the development of educational AR smartphone application that uses the Google My Maps for content creation. It is difficult for a teacher to teach all participants in field work at the same time. By using AR, participants can easily learn even in field work. We have developed an AR smartphone application that can read Google My Maps. Since Google My Maps is easy to create, teachers can easily create AR contents. This smartphone application was developed using the Wikitude SDK. By changing the sample code of location based AR, we were able to display the AR contents in the required way. The development of this application realized the following points. Users can enter the URL of Google My Maps directly. The display of POI (Point of Interest) by application is real time and accurate. The position of the POI moves in conjunction with the movement of the smartphone. The far POI can be displayed. The number of POI can be reduced by distance. Users can browse photos registered on Google My Maps.