Am I the only one that thinks HondaLInk is useless?
Ah, different beast. That is a navigation app that streams to your "HondaLink Ready" dash screen. I was looking at apps that work with the software menus built into HondaLink.It's the HondaLink Navigation NA app.
Here's a few...If you search this forum for "HondaLink", you'll find dozens of posts on this feature and answers to all of your questions.
I'll comment further on #3: The route is sent from the your smartphone to the vehicle over a Bluetooth connection - not from satellites. The vehicle does not receive any data from GPS satellites other than the time of day. Map data is stored locally, the vehicle position is calculated from time signals received from multiple satellites, and traffic information comes from FM radio stations near large cities.
HondaLink has generally been a frustrating disappointment in each of the six Hondas I've owned that had it. It's operation is intermittent at best.
I no longer even bother installing the HondaLink app on my phone because I was annoyed by it opening itself randomly 50% of the time when I start the vehicle.
There are at least three different versions of HondaLink with different capabilities and different connection methods that are all called "HondaLink". Our Ridgelines have one of the older, less-capable versions. Newer versions display additional information. The newest version operates over 4G LTE which allows additional capability such as remote start, light flash, horn honk, view tire pressures, fuel level, oil life, odometer, door/hook/trunk status, lock/unlock, etc. from anywhere in the world. I expect the 2020 Ridgeline to include this version except without remote start.