GM remotelink is rubbish...
the app only works if you have OnStar subscription, too expensive for basic functions such as checking tire pressure lock and unlock (but the app is broken)
slow to connect, slow to response, when you want to check error codes or tire pressure you have to "sync" the app with the car and it works 1 out of 5 times and it took 10-15 min in general...same with unlocking, it took 15 min between using the app and the car actually unlock itself with a 20% success rate!
Send to car navigation is via bing map, basically you look for a location in the in-app bing plugin (slow and it wont recognize the address unless you are very very specific) and it send to the car via OnStar which gives you voice prompt...
bottomline is if you have OnStar subscrption, you can simply call in and perform the same function with a fraction of time and you get to talk to a real person who is smarter than this app