Stoker has a Garmin 800 and navigates for us. We use a Garmin GSC 10 Speed and Cadence Sensor on the left chainstay. Captain uses a Cateye Stealth 50 unit. Both units receive signals from the GSC 10. Captain's heart rate is displayed on both the Garmin and Cateye units. Stoker uses an inexpensive Polar unit for her heart rate, which she matches to Captain's HR. This has worked very well for us for several years.