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For the bike, I use a Beeline. It's a dongle Bluetooth to my phone. It gives arrows and distance markers for a quick look and attaches to the handlebars. It has it's own Navigation Ap and can also supposedly load map files. I got it from a member here for a good price.
I still use paper maps..🤷♂️🤷♂️
Possibly the biggest negative is if the phone pops out of the mount and is lost or damaged so it doesn't function, that is a big dent in the fabric of our lives.
I am a much more casual rider than years past, but still prefer Garmin waterproof models. ..snip..My issue with cell phone navigation is signal. In the boonies it can be sketchy.
I found Garmin units to be too fragile. And too expensive to have them break all of the time. I also like the numerous app/map options on a smartphone. I have used nothing but the smartphone for over 10 years now. My broke GPS units are on a shelf.Queue an idiot that thinks a smartphone does not work where there is no cell service in 3...2...1....
I had a nice waterproof Garmin 276C that filled with water on a rainy ride. Another Garmin StreetPilot 3 that the power connector started to smoke on a rainy ride. I have had a lot of issues with Garmin's in the rain. No such issues with my Samsung other than the touch screen being goofy until it dries out. What signal do you mean? I have used my smartphone on forest roads all over the Smokey Mountains where there is no cell signal. Still works great.
You don't need an embedded gps in a device that large. There are many GPS options that connect via USB. We use them for nav on boats a lot.