I have a nuvi 780, but as above, if it's raining hard, I'm parked.
They can take a bit of rain, but I wouldn't leave it on during a downpour.

 

I use a garmin, not the 800$ version...cheapies work fine...if you find yourself in a rain storm, do what you do...put a rain coat on it. A small baggie or ziplock will work great with a rubber band. I keep one in my bag at all times. You can see it and it stays dry. Just slip the baggie over the top, rubber band it closed at the bottom and go...it isn't alive, it does not need to breath, if you are worried about heat, hey it's raining...and cooler...just leave a corner open to get some air...there ya go...cheap and efficient. Now go take that Harley $$ note and ride in a driving rain storm!

 

I used a nuvi200w with a ram mount for a couple years, no problems. Used a baggy and a rubber band in case of rain. I have a zumo 550 now and love the weather and XM

 

I also us the Nuvi 200. Can't beat if for about $100 bucks.

 

Thanks for all of the replies. I may have to look for a reasonable Nuvi unit on Ebay. I used to have a Zumo 550 but sold it a couple of years ago. I am currently using a Garmin Quest 2, but the screen is pretty small. I would really like to get a Zumo 660 or the new Zumo 665, but I can't really afford it right now. They are nice units but way too expensive.

Lugthar

 

That mount is a hell of a lot cleaner than the RAM mount. What kind is it?

 

+1 on the baggies. I bought the cheapest wide screen I could find nuvi255w and a Ram mount on my RK. Recently rode most of the afternoon in the rain and forgot to bag it.... still works.

 

765T and it has gotten pretty wet... no issues ever. Lost my damned baggie lol or I'd never have taken the chance. I wouldn't submerge the sucker though.

 

 

I found it on eBay. It was about $40, but well worth it for the looks.
I can find the link when I have time if you want.