Anyone use a Bluetooth dongle to transmit the gps directions to a headset?
Yes, I ddi this with my dezl 760. The 760 still has an audio out plug. I have tried a few and some worked better than others, but any transmitting dongle generally does the job. I always power them from the bike. Most generic dongles are receivers, so search specifically for transmitting dongles. I got a small 12v to 5v power unit and wired that in at the dash, then plugged the dongle into it. Scotch dual-lock attached the dongle to the top of the GPS Ram cradle. Easy enough to unplug and pull the GPS when needed and it stayed in place just fine.
I was using the dongle to send GPS sound to my Sena 20S Evo. If I paired the phone, I just did it direct to the Sena. I could have listened to audio books thru the card in the dezl 760, but never tried to do that or see if I could put music on an SD card and listen from the GPS.
If you want music, your best bet is going thru the phone and an unlimited data package. Pandora or similar. Otherwise you're looking at finding a Zumo 550 and adding XM subscription as a second unit, just so you have music. The wife has had her 550 since '11 and you won't get it from her w/o prying it from her cold, dead hands. And if you go that route, never update! It will brick the thing or if you're "lucky" just eliminate the XM functionality and you'll have to send it off for repair and re-doing the firmware back to a version that can handle XM. And you still won't have current maps. BTDT, got the bills to prove it. She still uses the 550 for other functions, but uses a newer GPS for any routing/mapping work.
@Concourstador - I did the zip lock bag and hair ties over my dezl 760 and 2797 if it was going to rain all day or was a hard rain. The 760 survived a 30 day Alaska trip in June where it rained every other day, most of the day, w/o issues using the baggies as needed. A gallon size worked for me. Not ideal, buy you can buy a lot of zip lock bags for the price difference between a Zumo and a dezl.
@ethanan - I suppose battery life depends on how many hours a day you're using it. Here is a comparison for handheld GPS units.
LINK Most seem to be around 16 hours, with a couple more than that with different batteries. My car/bike units are more like an hour or two at most off the bike battery life.