NOSTR notes are very flexible. For example you can have the json include metadata which is essential to know where it should be going, or you can encrypt everything and send what looks like "garbage" to an open relay that can only be fetched by anyone with a key.
There are dedicated profile notes which define which relays that account/identity prefers to send their messages but everything is flexible. It does forego much of the routing metadata, which in my opinion is an obstacle when you don't know which stations/relays are placed on a given geography but you want the message to "navigate" (sometimes quite literally) to a place/region.
For that type of things I'm a biased fan of https://xprs.dev because it bridges NOSTR identities/signing/encryption with APRS that can use store/forward and the routing follows any possible method include USB drives.
There are dedicated profile notes which define which relays that account/identity prefers to send their messages but everything is flexible. It does forego much of the routing metadata, which in my opinion is an obstacle when you don't know which stations/relays are placed on a given geography but you want the message to "navigate" (sometimes quite literally) to a place/region.
For that type of things I'm a biased fan of https://xprs.dev because it bridges NOSTR identities/signing/encryption with APRS that can use store/forward and the routing follows any possible method include USB drives.