Anecdotally, my wife's iPhone 12 mini worked better than my Pixel 6a. I found I had to force restart the app quite a bit. We did two 7 day voyages back-to-back and I reinstalled the app completely around day 10 and it worked noticably better after that. The big red table on deck 7 can help out if you have issues. They recommended disabling VPN and some other settings for a more reliable experience.