Geo-registration of pupils good idea or subversive monitoring?

Apps for Schools have just released our first app with the facility for sixth formers to register via a geo-location function within the school's smartphone app. The student downloads the app and registers as a user. When they need to notify school that they are in school, they register within the app. The app users their geo location positioning and asks them what activity they are engaged in. This activity is presented as a drop down list from

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