Yes. You really need a GPS. Yes, you really need a high quality mount. You just bought a '16 ES for crying out loud. What is a few extra pennies for getting a GPS?
Migsel had some really good mounts for the ST1300, their quality is excellent. I do not recall reading anything bad about them.
WynPro is run by one of our forum members and he makes some other nice accessories for our FJRs.
Others may disagree, that is okay... I LOVE the looks of the FJR. I love the look of the Gen3 and I was not willing to "ugly" my new bike. The WynPro mount almost looks factory, it is inconspicuous, it is functional, it is Just Right. It will not work if you add a HeliBar bridge or an MV Motoradd bar setback system but will work with the GenMar blocks. I love mine.
And I can honestly say it is worth WAAAY more than I paid for it! (Thanks Dave and Dave. I have not forgotten)
FWIW, when I travel I use the GPS, my phone, typed turn by turn directions, and a whole stack of paper maps. The GPS is just one tool among many.