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tfk is the founder and author of the5krunner, an independent endurance sports technology publication. With 20 years of hands-on testing of GPS watches and wearables, and competing in triathlons at an international age-group level, tfk provides in-depth expert analysis of fitness technology for serious athletes and endurance sport competitors. ID

im pretty sure stryd support will show up soon on this watch. it´s a runners watch and i´m pretty sure upcoming competitors will have these features (FR 245 etc)
I hope so for polar.
but for garmin its not straightforward…think power zones, all the averages and power alerts. it’s not just that they already have ciq data fields showing. polar still haven’t got all the peripherals firmware bits fully working/integrted
After years with S625X I bought M430 in January. I have a problem with optical HR accuracy. I have a conversation with Polar support, check many sites searching for the solution, but nothing helps. M430 simply isn’t accurate at the beginning of training.
I wrote my (honest) review with the video which shows the problem and compares optical measuring HR and strap measuring HR.
Here is my problem which should check every potential buyer:
http://kacnje.blogspot.com/2018/02/polar-m430-unusable-optical-heart-rate.html
optical HR varies from person to person.
you may well have serious problems with one watch and someone else will find it works 100%…it’s the way it is from all vendors with all tech on the wrist
arm worn sensors are much better but some people still have problems there too
I have exactly the same problem as Iztok. For the 1st 7 to 30 minutes hr stays way low then suddenly jumps to correct level. Also at the end of a training session the hr often stays incorrectly high for 10 minutes and then suddenly drops to correct level. When used with a strap it works fine – but that kind of defeats the purpose of the watch!
Others on the net report the same problem – Polar needs to fix this
noted.
is this a recent thing with a specific firmware or the weather?
all manufacturer OHRM units are prone to error