I put the destination into the built in one but only so it can show any traffic jams as it constantly changes arrival time, runs about 20 yards behind where you are so you would always miss your junction/turning etc and it has as much detail as a blank piece of paper(really, it’s the worst system I have ever known).
Luckily I spent years driving a truck to all 4 corners of the UK and even 2 years in Northern Ireland so have a pretty good idea where I’m going most of the time and I use the 6′ screen in front of me to warn of problems.