I use my smartphone and my MAP60Csx.
I use the Cachly app for searching and filtering caches, either live or from an offline list. Then I select the cache I wish to navigate to and use my choice of Apple, GOOGLE or WAZE maps to navigate to the target with turn by turn prompts, voice prompts and even alternate routes.
A dedicated car GPS seems wasteful when the smartphone does the job even better.
Blue -