Hi from Africa
Have a looks at
www.tracks4africa.co.za Most all your questions will be answered
I use T4A on a Samsung 10.1 TAB and mounted in my LR on RAM mount, with a 1 inch RAM ball bolted to the dash. Off Road I don't want a projectile.
T4A is not intended to be used in cities and although main roads are covered, street level details not there. If you do need streetmaps on a Garmin, suggest look at
www.garmap.co.za I am sure Tom-Tom and others have similar products.
I use T4A extensively in my African travels with my two sons and always back it up with a Montana Garmin loaded with Garmap Streetmaps and T4A.
Google maps work well if you do have 3G or LTE/4G services but be warned ... data in Africa will break your budget and coverage is main cities only.
You cannot go wrong with T4A ...been submitting data for years but you need a dedicated GPS like a Garmin. Ipad and TAB's not that great quality data so not used at all.
Happy to answer any questions.
Cheers from Africa
Aubrey