New App-based system from Customs and Border Protection

[Teranodon]

I've been told by a local CBP officer that the ROAM App-based system can now be used in our area. It had been under evaluation on the East Coast. It provides a way of checking in without making a phone call or (and of this I'm not sure) going to the dock.

https://www.cbp.gov/travel/pleasure-boats-private-flyers/pleasure-boat-overview/roam

I installed it without problems on my iphone, but have not had occasion to use it. Does anyone have experience with it?