I just received the Mio Link heart rate sending unit I ordered. It works great through Bluetooth with my iphone, but I can't get it to link to a sports watch I have. The watch works fine with a chest strap, but it isn't seeing the Mio ANT+ signal. Anyone have any ideas?

I've been using a Mio Link for three weeks. I can't offer any advice, only a couple of observations.
ANT+: My Garmin Edge 800 finds the Link as soon as I turn it on.
Bluetooth: My iPhone sometimes requires some fiddling to get them to pair up.

Try putting your iphone out of range of the HR sensor while you pair it with your ANT+ device

Yeah, I turned off the Bluetooth on the phone, but the watch still didn't find the HR sensor. Maybe the watch is defective. I haven't used it in quite a while. Funny thing is that when the HR sending unit on my wrist was a few inches from my old, old simple bike computer it recorded my HR instead of my speed as if it were speed. The distance ridden was affected and average speed, etc. Could those old wireless bike computers be ANT +? I'm not talking about the ones with GPS, etc., but just the 10 year old ones with speed and riding time. Funny.

Can you change the device pairings in the watch's settings?

My Timex Runtrainer requires you to manually enter the serial number of the transmitter if I switch.

Does your watch allow 2 different ant+ heart rate monitors to be paired. My cateye stealth let me pair my chest strap and mio link, but no more.