It is possible that your tablet does not have a GPS receiver. All cell phones have a GPS; some low end tablets do not.
You should be able to run the following code to check
testforGPS.aia (1.6 KB)
Pressing the Button on this simple app will respond with true or false, as the case might be.
Also, look for the marker icon at the top; if you do not see it, the gps is not active.
It is also possible that your Device Settings on your Android are not providing permission to use your location information. The Location sources boxes must be checked to use the LocationSensor.
Have you done this tutorial and tried the aia files to test your device Using the Location Sensor ?
Also
To work with the Map component; use this advice How to put my location on a map - #2 by SteveJG