I can't see what we are doing wrong.
I can’t see or even imagine what you and your chums are doing either. But let’s see what can be done to assist, in a light hearted way.
First a disclaimer: I don’t own an XT, so I have no idea how its Bluetooth functions operates or even if it is compatible with a Nav VI. I do though own a Nav V and VI and can send complex routes from one to the other with ease. I do not have all the mumbo jumbo stuff, but more on that later. Here goes:
If we assume that it is compatible, Nav VI to XT and visa-versa, I would:
Properly create a simple route A to B of say 20 miles on your Nav VI. Create a different but similar length route on the XT. Give each a different name you’ll recognise and be able to spot amongst maybe the 100’s of other routes to Tesco and your mum’s that you have maybe saved on both devices.
Take one (not both) of the XT’s and, just for now turn off all the mumbo jumbo that it is connected to, like phones, headsets, the man in the moon or whatever. Similarly, turn off all the mumbo jumbo on the Nav VI. Your second XT, just turn off or hit it with a hammer. In other words, make sure it is definitely not in contact with either device. Just for the sake of it, make sure your motorbike, phone and any other technical wizardry either device might try to communicate through or with are all off and out of the equation.
Now attempt to send the route from the Nav VI to the XT, following exactly the instructions that appear on both devices. Just follow the instructions, don’t take any notice of “My mate says, he always does it standing on one leg” or some such. Does it work? Do you know where to find the route you sent on the XT if it doesn’t appear? If it does work. Great.
Now attempt to to the same thing but in reverse, sending the route you created on the XT to the Nav VI. Does it work?
If one person does all of this it at least removes one other variable of some chimp (ie your mate) sticking their fingers into the pie.
If the answer to either of the above is no, report back.
If the answer to either of the above is yes, report back.
If the answer is yes, then you’ll at least have established that it does work. Then reconnect all the other mumbo jumbo and repeat.
Does it still work? Yes. Case solved.
Does it not work? Then, logically, the mumbo jumbo, must have bolt-on bits, are feckin’ it up somewhere or it’s something else.