Apps installed on Google Nexus 7 can access users current location and provide feature depending upon the users location. But if you do want these apps to access the location details then you can turn off by following the below simple steps.
Step 1: Launch the Settings screen on Nexus 7.
Step 2: In the Settings screen, navigate to Personal section and tap the Location access option.
Step 3: Use the ON/Off switch to turn off access to your location for the Apps.
Please note that after turn off this service, apps that needs to access the user location to provide services will not work properly.