Well, "let me tell you a story."
Mainly, if "once upon a time" you could renew your Dynamic Navigation "via the app," that certainly doesn't exist anymore. And thus, prepare for a really awful experience.
"You need to buy a kit." Just do a Google search for "Toyota Dynamic Navigation Renewal," and you will find dealers that sell it. I don't really know if you can walk into your local dealership and just walk out with one -- presumably they could order it. I found a dealer across the country from me, which offered it for about a ten-dollar discount. And then they charged me about ten dollars for shipping.
They waited about a week before doing anything, and then it was another week before I received my kit in the mail. The kit includes a "part number sticker" on the package, which notes that "this can not be returned for a refund." Plus a USB thumb drive, and a little card with instructions. The instructions tell you to go into the Toyota app, where you won't find what it tells you to find.
The card comes with a support phone number -- I called. Indeed, there just isn't any way whatsoever to perform this operation via the Toyota app. No, you must take it to a dealer, though "they usually don't charge for performing the renewal." (Hold that thought.)
So, I called my local dealer, which is actually around a 30-minute drive from my house. Yes, they would be able to get me in within an hour, and it should take "15 to 20 minutes." So, I jumped in my car, and headed for the dealership. This was right before lunchtime, so I figured I'd treat myself to lunch after the upgrade was performed.
Well, "guess what." There doesn't appear to be a single, solitary human being in the entire Toyota corporation who has any clue whatsoever about how this works.
So the service writer says it will take "an hour to an hour and a half." Gulp. And that would cost me $130 for the service.
So at this point, I'm looking at my $180, non-refundable packet of garbage, unless I cough up another $130 to have anything useful done with it. So, what was I going to do? Walk out and run over the dang thumb drive several thousand times with my car? So I let them go ahead with it.
And when an hour and a half had gone by, with my car nowhere to be seen, I went storming into the service writers' office. "It's been an hour and a half. Where is my car?"
It took them another half-hour to finish the job, and bring my car out.
Believe it or not, I wasn't very happy with this situation. All I know is that the kit came with instructions that said you could do it yourself via the app. WRONG. Then the "expert" with Toyota Connected Services told me that "the dealerships usually don't charge for installing it." WRONG. Then the dealership's appointment "specialist" told me it would only take 15 to 20 minutes. WRONG.
Nobody has ONE FREAKING CLUE about how this works. Nobody in the ENTIRE CORPORATION. So, don't believe one word anyone tells you, except the guy who tells you to "fork over this much" to pay for installing the renewal.
Got it?
At this point, I would like to recommend searching for the YouTube channel, "savagegeese," which posted a quite comprehensive video a few months ago about how automobile manufacturers develop in-car technology systems. They managed to get a bunch of folks from Toyota to show them the process, and talk about it. Some day, I plan on digging out the names of these guys, finding addresses for them, and writing to them, pointing out to them that THEY ARE WASTING THEIR TIME with this stuff if their company absolutely, positively cannot begin to support it properly.
Now to answer some questions. I've been there, so this is how it works:
If you don't renew your Dynamic Navigation, your navigation still works pretty much as it did while it was in effect -- it just won't "look on the cloud" for the latest maps and such. One road I take about every week was a "new" one that completely disappeared after my Dynamic Navigation expired. Your "favorites" will still be there, and they will work. You can use voice commands just like you did. But it won't be able to give you directions for roads that don't exist on your original maps. I do believe that "traffic information" is not part of "Dynamic Navigation" -- that still works, as it did with Toyota navigation systems before "Dynamic Navigation" was ever developed and unleashed on innocent customers.
I waited about six months after my Dynamic Navigation had expired, before I went through the ordeal described above. And by that time, my "Remote Connect" service was nearing the end of its term. Somewhere in my discussion with the so-called alleged Toyota Connected Services "expert" I described above, we wound up talking about the credit card they had on file for me, and it's something I cancelled a year or so ago, since I just wasn't using it at all. Yes, I could go into the Toyota Owners app and update that, which "gosh golly," I haven't done. So, I entirely successfully managed to prevent my Remote Connect service from renewing automatically.
OK, so is Remote Connect some kind of "prerequisite" for any other "connected service?" Not that I have seen. It's just the service that it describes -- showing information in the Toyota app, if you find that useful. I rarely found it useful, and most often, I sat there fighting with the app on my phone for 15 minutes trying to get it to work, rather than walking about ten feet into my garage, and looking in the car, myself. So, that's how I consider I "recovered" the money that my local dealership charged me to do the Dynamic Navigation renewal.
In the end, I was going to do a considerable amount of out-of-state travel, and I figured that it would probably help to have Dynamic Navigation, as roads and such do change over time. I'm not sure that I'll renew it again -- certainly not without asking lots of people lots of questions, first. Perhaps you can find a dealership that will install the renewal for free. But somewhere on this forum and elsewhere is the TSB or whatever it is that describes the process for installing that renewal -- and it's like 12 pages to 20 pages long. I'm pretty sure that it truly did take my dealership around two hours to get that work done, and I'll bet that it'll be a rare dealership that would do that much work for free.
I hope this helps. By all means, ask questions about this, if you have any.