Concept2 PM5, Apple Health and Apple Watch
Apple Watch is the most significant major heart rate monitor NOT to integrate with the Concept2 PM5 -- so you can't get integrated workout data for indoor rowing.
The Apple Watch "rowing" activity is basically worthless because it doesn't store power, strokes and other rowing specific data.
The only solution currently is to use Concept2 Logbook for rowing data and the Apple Watch activity app for hear rate.
This makes Apple Health much less valuable -- because I want my running and rowing data all in the same place!!
Apple Watch