Welcome to the community forum.
First things first: Fairphone don’t sell and support anything in the North American market yet. You are free to import a Fairphone 4 on your own responsibility, Fairphone can’t support you directly there. Additionally please see https://support.fairphone.com/hc/en-us/articles/202005103, section " Shipping outside of continental Europe".
Please read and perhaps ask here … Fairphone owners in the USA (FP2 FP3 FP4 FP5).
Source? The Fairphone 4 apart from being much more ethical overall is a totally normal Android phone.
Which map Apps do you use? The major players in this field should work fine at least.
You can.
https://murena.com/ (official partner of Fairphone)
https://iode.tech/en/
oslist
I’m using /e/OS on a Fairphone 3. Text-to-Speech (TTS) is included in /e/OS, so maps Apps can use it.
Should the need arise to get by without TTS on any phone, you might be interested in the fallback solution included in the Open Source maps App OsmAnd (Play Store / F-Droid - the F-Droid version is the + Version for free, which costs money in the Play Store, supporting the project) …