This is a long known runtime-only (not permanent) tweak to override so-called "security protection" (or if put in other way, "competition deterrent") mechanism to auto-disable HDMI when the car is 1)off parking brake, 2)moving, 3)moves faster then 5mph. The idea is to mirror your iPhone to large dashboard screen (but not to the smaller screen above) and use whatever app you want. You will need a $99 cable from Honda, or a cheaper one from Apple or even Walmart, they sometimes work as well, depend on your luck.
Essentially it is a combination of hardware keys you press and hold together in certain conditions, which reveals a hidden configuration menu, and allows you to temporarily disable this option (known as VSP error) until the next ignition cycle. The actual combination and conditions depend on the car year/trim and possibly firmware version, so not posting any details here (let alone it may be illegal by forum rules at the very least). Lots of examples on youtube, just google your year/trim with something like "HDMI enable when driving".
I couldn't get this to work with my 2015 Touring, though.
Another option is to jailbreak your iPhone to install an outside tweak that would let HondaLink application to be active in the background regardless of what other application you use, so the dashboard will allow you to use Google Maps, Waze etc. believing you gave in to non-competitive $60 Honda's Navi for iOS.
So, all above considered, getting a cheap 7"+ tablet and mounting it Tesla-style may be the easiest options for non-techies, especially if equipped with offline maps.
