In that particular case no.
My setup is searchable ZIM files on a pen drive. I open the file with a viewer on any PC or f-droid capable android. No servers involved, no handoff of data involved. More like a book as last resort.
Maps are openstreet maps downloads in osmand.
From my perspective there is no need to over engineer a basic tool.
For example, take a look at those TEOTWAWKI preppers. They’re hoarding books, ebooks, literature and knowledge in the most robust and reliable way. No need to add a tech stack that might or might not yield the proper answer and might or might not hide important facts in the summary.
Edit: https://feddit.org/comment/12160220 this fella has some great additions, too. E.g. Unnecessary resource hunger.

Did you follow the news on the total energies settlement?