I’ve used OrganicMaps in the past, but for searching POIs and ahead route planning its just unusable.
Meanwhile i’ve found GraphHopper, an open source search, route and (experimental) navigation app from Germany. Great thing: its blazing fast! Check it out on F-Droid.
This looks like a copy paste from clockwork with their DevTerm and uConsole. I have a uConsole and really like it. Despite that it had a small year needed to ship it. It is now running stock Debian Bookworm and the community is growing. Its running on a CM4 and CM5 is almost done as well thanks to a very active community user. Software support is shit, but the hardware and software are open source so there are already a couple. Of expansion boards (4G, GPIO, USB hub, Pico2040, and GPS/LoRa in the making)