I use Komoot, only as it was bundled with my Wahoo computer. I used to be you get the mapping for your area free. Then if you want to venture to another area you buy that. On my bolt head unit komoot gives me detailed instructions and turn by turn guidance ( bit like on a car system) i bought Wales I think that was £6 lake district was 3/4 quid.
Key thing is to do some research to check it will run as a companion app with your Karoo 2