The Forerunner 245's heart rate monitor is also highly accurate. I used a Polar H10 chest strap to compare results, and during a one-mile walk, the watch recorded 126bpm to the Polar's 128bpm Integration with Edge. I have been using Edge 820 for my bike rides. Since I got the 245 I noticed that the heart rate on the watch is very different from the one I get on my Edge (coming from a chest HR monitor). I tried adding the HR monitor as a sensor to the 245, but it seems that the 245 only reads the data from the HR monitor only if it Troubleshooting. Product Updates. Getting More Information. Activity Tracking. Acquiring Satellite Signals. Restarting the Device. Resetting All Default Settings. Updating the Software Using the Garmin Connect App. Updating the Software Using Garmin Express. New heart rate reader. This one was predictable: the Forerunner 255 shares its Elevate V4 heart rate sensor tech with the more recent Garmin watches. It has more light sensors than the older Too low or not seeming to record at all I tried checking my watch, vivosmart 5, during workout. It seemed to be showing the accurate heart rate. But in the training data it seemed to be way lower. Tried everything. Cleaning the thing. Resetting the watch. Reinstalling the garmin connect app. The HRM-Run should give you all the run Dynamics, so it's the most full featured strap for the 245. The Tri adds swim mode that 2xx can't use anyway. I prefer an optical bicep band myself though (Scosche Rhythm, Polar OH1, Wahoo) dark_77 • 4 yr. ago. "The HRM-Run should give you all the run Dynamics, so it's the most full featured strap for Body battery is not bad, it’s a useful guide but I tend to listen to my body rather than the watch. My eldest has a 245 and I have a 735. The 245 is good for cycling as long as you have a chest Heart rate monitor not working. I have a Garmin Forerunner 245 music and the heart rate monitor isn’t working when I put it on my wrist. I checked to see if it was accidentally turned off, but it wasn’t and my watch connects to Garmin connect just fine on my phone. This just started happening today and didn’t previously have this problem. The device requires you to complete a few activities to learn about your performance. The recovery time appears immediately following an activity. The time counts down until it is optimal for you to attempt another hard workout. The device updates your recovery time throughout the day based on changes in sleep, stress, relaxation, and physical A heart rate zone is a set range of heartbeats per minute. The five commonly accepted heart rate zones are numbered from 1 to 5 according to increasing intensity. Generally, heart rate zones are calculated based on percentages of your maximum heart rate. Setting Your Heart Rate Zones. Letting the Device Set Your Heart Rate Zones. s8HJr.