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Replying to @SuspiciousCarrot78@aussie.zone
Someone over on !perth asked a good question and it made me realise…it’s PiMaps (duh).
Which means you could probably host this on a Pi Zero 2 W with an SD card, then just connect your phone to its Wi-Fi hotspot.
Plug it into your car lighter via a converter, or even easier, run it from a USB battery bank.
So, for about $100 USD, if that, you could have a little “car server” that feeds PiMaps to your phone using basic off-the-shelf gear that you literally Lego together.