Various issues with my Fenix 5X

I've been persevering with my 5x for a couple of months hoping that the pacing issue will improve, but it's still entirely unusable as a training tool for me. Yesterday's session was a bunch of 4:15 min/km intervals, each 3.5km long on a long smooth loop, so plenty of time to monitor the pacing info and a steady pace for the 5x to get a handle on. The pacing read in excess of 5:00 min/km throughout, often as high as 5:45 min/km, yet the 1km splits were all in and around 4:10-4:15 min/km. And though my trainers are pretty dry, I still seem to run through a lot of lakes if the GPS is to be believed.

Back to the largely reliable 920xt for me.

Hi, I got my Fenix 5X on Friday 31st March but am having various issues with it:

HEART DATE
Heart rate data is very inaccurate here are some examples: On Saturday 1st April I ran a 5 mile race in a new pb so was clearly pushing but my average heart rate for the race was recorded as an average of 145 with a max of 162. Then 1 1/2 hours later I did a 12 mile run the first 8 or 9 miles of which were at a nice easy pace and in between tthe 5 mile race and this run I didn't take off the watch, adjust the strap etc but around 40 mins in my heart rate suddenly jumps to around 160 and then stays there. Then around 1 hour in when I decided to up my pace and push myself the is no noticeable increase in my heart rate if anything it dropped. Then finally near the end of the run I eased my oace right off but my heart rate doesn't drop. In subsequent Easy pace runs my haart rate also seems very high.

PACE
On the same 5 mile race my pace drops a couple of times to around 7:20 min mile / pace whereas in reality it could never have gone slower than 6:20 min / mile pace.

3rd April I did a 6 and a bit mile Easy pace run, a run I have done literally hundreds of times so when I downloaded the data to Strava I was surprised to see the distance had been increased and my pace therefore made faster. When I look at the data on Strava Connect I see I had a fastest pace of 4:29 min / mile which clearly is wrong as are the occasions where the data shows circa 9 min / mile. I contacted Strava about this and they said "it looked like some erroneous GPS data in the file was causing your distance to be over estimated. *I recalculated your distance ignoring the GPS data".

4 April same issue as yesterday although this time I haven't as yet contacted Strava.

My watch is running Software 2.50 (9032377), for running I have the watch set to GPS + GLONASS, I have 3d speed on, 3d distance on plus in general settings also data recording to Every second.

Here are the runs I have mentioned:
5 mile race Check out my running activity on Garmin Connect. #beatyesterday
https://connect.garmin.com/modern/ac...re_unique_id=8

12 mile run Check out my running activity on Garmin Connect. #beatyesterday
https://connect.garmin.com/modern/ac...e_unique_id=10

3rd April run Check out my running activity on Garmin Connect. #beatyesterday
https://connect.garmin.com/modern/ac...e_unique_id=12

4th April run Check out my running activity on Garmin Connect. #beatyesterday
https://connect.garmin.com/modern/ac...e_unique_id=14

Hello RogerPaolo. i can strongly support this fact,that it is absolutely neccessary to wait about two minutes for both GPS and HearRate lock. For GPS there is the growing circle that turns from red to green, unfortunately there is no similar simple signal-light for HR-reading-lock. so if you are somewhere having good gps-reception and therefore you start running right away after gps turns green after e.g. 30sec, the HR-Sensor locks in on the mix of step frequency + Heartrate = rubbish.
so: no running during the first two minutes. This is one of the reasons i only run with chest-strap...

Best regards, Thomas

Hi, I got my Fenix 5X on Friday 31st March but am having various issues with it:

HEART DATE
Heart rate data is very inaccurate here are some examples: On Saturday 1st April I ran a 5 mile race in a new pb so was clearly pushing but my average heart rate for the race was recorded as an average of 145 with a max of 162. Then 1 1/2 hours later I did a 12 mile run the first 8 or 9 miles of which were at a nice easy pace and in between tthe 5 mile race and this run I didn't take off the watch, adjust the strap etc but around 40 mins in my heart rate suddenly jumps to around 160 and then stays there. Then around 1 hour in when I decided to up my pace and push myself the is no noticeable increase in my heart rate if anything it dropped. Then finally near the end of the run I eased my oace right off but my heart rate doesn't drop. In subsequent Easy pace runs my haart rate also seems very high.

PACE
On the same 5 mile race my pace drops a couple of times to around 7:20 min mile / pace whereas in reality it could never have gone slower than 6:20 min / mile pace.

3rd April I did a 6 and a bit mile Easy pace run, a run I have done literally hundreds of times so when I downloaded the data to Strava I was surprised to see the distance had been increased and my pace therefore made faster. When I look at the data on Strava Connect I see I had a fastest pace of 4:29 min / mile which clearly is wrong as are the occasions where the data shows circa 9 min / mile. I contacted Strava about this and they said "it looked like some erroneous GPS data in the file was causing your distance to be over estimated. *I recalculated your distance ignoring the GPS data".

4 April same issue as yesterday although this time I haven't as yet contacted Strava.

My watch is running Software 2.50 (9032377), for running I have the watch set to GPS + GLONASS, I have 3d speed on, 3d distance on plus in general settings also data recording to Every second.

Here are the runs I have mentioned:
5 mile race Check out my running activity on Garmin Connect. #beatyesterday
https://connect.garmin.com/modern/activity/1654036834?share_unique_id=8

12 mile run Check out my running activity on Garmin Connect. #beatyesterday
https://connect.garmin.com/modern/activity/1654207228?share_unique_id=10

3rd April run Check out my running activity on Garmin Connect. #beatyesterday
https://connect.garmin.com/modern/activity/1655566375?share_unique_id=12

4th April run Check out my running activity on Garmin Connect. #beatyesterday
https://connect.garmin.com/modern/activity/1657293908?share_unique_id=14