I saw this mentioned on FB, in the Solitaire Wargames group, and thought some under mandatory government lockdown might find it entertaining, since it's also very inexpensive – $4.99 USD from Wargame Vault:
link
I have no connection to WGV, or the author/owner of the game.
For those of you unfamiliar with "Operation Drumbeat", that was the German U-Boat Campaign conducted very early in the war along North America's Eastern Seaboard.
I haven't tried it yet, but it does look interesting, and I suspect, in order to enhance the game a little, you could even run it with miniatures too, if desired, with little or no tweaking, in order to add to the ambiance of the experience.
Enjoy!
Please post your after action reports and photos here, if you do.