Your device probably doesn't have a magnetometer (compass). GPS function is not enough for geo-location samples, without a magnetometer the device doesn't know its orientation in space and cannot track movement.
almost 4 years ago
I am trying to run the Android SDK samples (from WikitudeSDK_Android_5_0_0 zip) on a Samsung Galaxy Tab 4 tablet (SM-T535), which has a GPS module built in. Anyway, the sdk does not find this feature, and when I run the sample app (.apk), only the samples which do not require GPS feature are shown in the application.