I've noticed that with quite a few of the cheaper (sub $150) tablets compass apps and google sky maps don't work. As in example I got my Mum a cheap thing for her to browse the web and look at emails on, cost me £75 ($120ish?), some NATPC foreign brand. So no compass apps work, one states "no/faulty magnetic sensor!". Google sky maps only pans vertically not horizontally, making it useless, I assume it might be related to the tablet lacking a sensor, though I've heard this sky maps issue can be the case in branded tabs like the google Nexus 7. Thing is I never see "magnetic sensor" mentioned in a tablets specifications. So how are you to know if compass apps and google sky maps will work? I'm going to get my girlfriend a tablet for her birthday, I'm used to buying from far eastern companies and although I have safe bets like the Kindle fire, Samsung v2 tab etc, it can be the case you get more features from other brands (GPS for example), albeit you're more on your own when it comes to figuring out issues, so I'll look into it. But in all these cases, I just want to know what to look for, if there's any way of knowing?