Another option is to just buy a cheap android phone and you can download Google Maps for your area via Wi-Fi. The GPS in the phone will allow you to navigate.
In addition, for less than $200, several Chinese manufacturers offer devices that add Apple CarPlay and Android Auto functionality to motorcycles.
LAMTTO 7-Inch Wireless Motorcycle Carplay GPS Navigation System with Apple Carplay and Android Auto, Portable Moto Car Play Screen with Dual Bluetooth, Navigation, Siri, Google Assistant, Anti-Glare
https://a.co/d/9OxVegu