Micheal,
Yes the iFly GPS App works with the Dual XGPS 150, 160 and 170. We actually sell the XGPS 160 on our webstore for $149, It is the latest and greatest Dual with 10Hz GPS refresh, WAAS, Glonass and the ability to connect more devices to it simultaneously. Here is a link.
https://www.iflygps.com/shop-t136/dua...
Just make sure you select the Dual XGPS from within the Connected Devices, under the Menu -> About option.