My wife is the Iaero user and she is a triathlete.
We do not need the ability to see power data on a Garmin, according to her

She does want to use one HRM strap for each of the three disciplines, swim, run and bike.
What is the least we would need to buy from Garmin to get HR monitoring from one strap on both units? Any? Or is there a series that they start being compatible?
Now, given that I might want power or other data displayed, where does this start?
Will a 305 read the Ibike sensors, I believe the reverse is not the case without Garmin Firmware. Again, what series do I need to look at to start the process?
Cheers for any input
Bex