no additional apps. it syncs to harry's like the obd2 reader doesDo you run any additional apps on your phone to use the Bluetooth GPS? Also where do you have your GPS mounted?
i have these:
https://www.amazon.com/gp/product/B07M9CZYTD/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
https://www.amazon.com/gp/product/B008PGHRLQ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
and yes - the portable friction mount sticks like magic. I just lay it on top of the dash, you can see it slightly behind the phone in this video: