Great app considering it is web-AIS
I use this in Long Island Sound which is busy with commercial and ferry traffic. Boat Beacon is wonderful in the fog with or without using radar. Makes me want real AIS except for the expense, installation and upkeep of same.
App has an annoying habit of crashing every so often when I am running it in the background "tray" and wish to return to update ships after doing other tasks on iPhone.
All in all an amazing app. Get it
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Boat Beacon