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Google supports multiple passkeys for an account. As does Github.
I have not had any issues with iCloud Keychain and Passkeys. Apple also does provide the ability to share passkeys to others within your family.
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With Apple, Microsoft and Google, I have registered multiple Yubikeys and passkeys on each of them.
With Microsoft, I also deleted my password and removed SMS and telephone call 2FA and account recovery. You have to leave one method of account recovery, so I have it going to a private email address.
I thought one of the advantages of Passkeys was that you register one per device and if a device is lost or stolen, you log on with another device and rescind the key for the stolen or lost device…
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Regarding GPS, aren’t ship’s captains and navigators still required to plot courses manually? When I was preparing for my Yacht Master’s exam, we could run GPS, but had to plot the course manually.
When my father did his navigation exam, they sat him below decks with starting co-ordinate, a clock, compass, tide tables and a protractor and he had to navigate around a set of buoys several miles apart!
Also, at sea, you generally don’t run to a GPS course, at least on a yacht, you give the end waypoint in, but if you are sailing across the tidal flow, for example, you let the boat drift with the tide, because, when the tide turns, you will drift back the other way onto the correct course. If you are constantly fighting the tide, you are wasting energy and speed - this assumes you are going a long distance, we were sailing up from below Biscay to New Haven in the UK.
My watch uses GPS for tracking walks, but I never look at the routes afterwards, I just use it to track the amount of training I do. When I drive or ride, I very rarely use the GPS - usually once or twice a year. The only thing that “needs” GPS is probably my weather app, but that only has to be accurate to about 20 miles - and Apple Weather is dreadful, anyway. I’ll often look at the app, before I leave work and it says sunny, but I’ll put my rain gear on anyway, because it is bucketing it down outside! 
Apple uses the MET in the UK for its data. Are they that wrong?
I would say, when there is a chance of rain, they are 75% wrong.