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The ESN# is just like a VIN# but for the head unit and it’s used by a company such as Sirius to determine if your system has or hasn’t been activated for their service.
It’s also used for map updates for the OEM navigation system.
I have a2017 Superduty with Nav system and want to update the maps.
I have a bypass near me that’s 4 yrs old and it doesn’t show up in Nav system.
Ahh okay.
Keep in mind that even though there’s a map update available, there’s no guarantee that the road you mentioned will be on the latest map update for the factory navigation because the updated maps are literally 2-3 years behind the maps of the main players in the market like Apple and Google Maps.