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You can and you should contribute - Open Street Map
(lemmy.blahaj.zone)
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Personally I think a great combo is mapping stuff out with the phone where you can survey the place and have GPS, and then sending those changes to a computer to polish in JOSM if needed (e.g. when you're building new ways and want to make their geometry nicer) which is a lot more powerful editor and more comfortable than doing it on a touchscreen.
But whichever editor you prefer, I concur that mapping is very fun and also useful. :)
(And a lot more straight forward than trying to make a change in Apple or especially Google Maps...)