Forerunner 965 - Recent Threads

RE: Wrist-based heart rate reliability worse since new updates

DeadwoodCS — Tue, 09 Jun 2026 20:15:30 GMT

Also, would encourage anyone else seeing this to log an official case and tell them to add it to the existing one, unfortunately I do not have a case number or similar

Wrist-based heart rate reliability worse since new updates

anic17 — Thu, 27 Nov 2025 16:05:01 GMT

Since one month ago or so, my Garmin Forerunner 965 has been tracking my heart rate deceptively bad, considering its price, both in running; have had cadence locks for 20 minutes, normal HR values and when pausing it goes back to cadence lock and surprisingly, for indoor cycling, where there's no arm movement at all.

This seems to happen more when I start the activity with a heart rate more elevated than usual, and then reports around 115-125 when the HR as checked by a chest strap is around 165-170.

I am aware that wrist-based heart rate is not the most accurate thing, but it is honestly too bad for the price I paid for it and considering that HR is the base metric for all other estimations and data (calories, VO2Max, training load, endurance score, RHR, HRV, stress, intensity minutes).

Any fixes, to recalibrate the sensor (apart from using a chest strap, which isn't always available)? Removing the watch and putting it again does not work.

RE: Wrist-based heart rate reliability worse since new updates

DeadwoodCS — Tue, 09 Jun 2026 20:14:21 GMT

I finally escalated this to support because I was tired of having to use my external HRM for heart rate data. The chat support experience was not very ideal. The first thing they had me do is to install the PC version of connect because "sometimes updates do not totally work over wi-fi" which is a bunch of BS if you know how these things work, but I did it and it did nothing to fix the issue.

Just got off chat now, the person acted like this had not been reported but eventually said there was a case that was open with no fix. I shared the FW version I started seeing this in and the HR data from the watch that shows the issue clearly... HR spikes to 190 then drops after 11 minutes to 155. Support told me to change my max heart rate to something that was not correct to "recalibrate" the sensor, which again I have no idea the logic behind doing that outside some algorithm that looks at max HR and once it is outside that it "fixes" the issue. I shared this forum link and shared all my data, said I would be willing to repeat/reproduce the issue if needed and was willing to test a POC or similar if they have a fix. Does not sound like they have any direct connection with R&D so not sure this goes anywhere.

We shall see but might be looking at other options besides Garmin

RE: Old bug in sun widget still not fixed

oBuTTuSo — Tue, 09 Jun 2026 16:34:35 GMT

Issue remains in v28.05

Old bug in sun widget still not fixed

oBuTTuSo — Thu, 04 Jun 2026 06:07:14 GMT

Here we go again, sun widget is broken this time of year for users way up north...

The old and now locked thread:

[mention:f65e49ee40aa459096198ec416203032:46448885d0e64133bbfbf0cd7b0fd6f7]

SW version 26.08 vs 27.09

Gogi — Sat, 17 Jan 2026 09:41:20 GMT

Just for info !!

RE: SW version 26.08 vs 27.09

jkissane_ — Tue, 09 Jun 2026 10:17:31 GMT

And for 28.05, there is no change that I saw.

Bundle: 28.05
GPS: 13.00
WiFi: 28.27
CIQ: 5.2.0
BMX: 21.1.0
WHR: 21.01.00
ANT/BLE : 28.27
TCS: 7.21
Sensor Hub 35.10
NFC: 3.5.8
WLT: 3.2.14

RE: Garmin needs to add Triathlon Coach to Forerunner 965!!!

Garmin - DK — Mon, 08 Jun 2026 18:02:03 GMT

Please submit your request here so it can be logged and considered for possible future use by the appropriate team: https://garmin.com/ideas

Garmin needs to add Triathlon Coach to Forerunner 965!!!

3506259 — Sun, 07 Jun 2026 14:56:50 GMT

Please make it happen now, Garmin!

Forerunner 965 - 28.05 - 50% Phased Rollout

Garmin-Kevin — Mon, 08 Jun 2026 17:14:03 GMT

Software Version 28.05 is now available for the Forerunner 965 at 50% Phased Rollout. You may manually download this software update by following the path below:

Menu > System > Software Update > Check For Updates

Change Log

Fix an issue that could cause some race events to be missing or duplicated after sending to device.
Fix an issue that could cause the Garmin Run Coach plan's week number shown on the device to be different than what is shown on Garmin Connect Mobile.
Fix the display settings not applying when changed from Garmin Connect Mobile.
Fix pairing to Schwinn devices.
Fix an issue with previewing workouts with only one step.
Fix an issue that could cause some activities to fail upload to Garmin Connect.
Specify completion time in audio prompts for distance intervals.
Fix an issue that could cause a crash when saving an activity after course navigation.
Fix an issue with China OSM maps.
Various bug fixes and improvements.

Enable Custom Track Distance Settings for Non-Standard Athletics Tracks

cescato — Wed, 17 Sep 2025 14:47:57 GMT

Track Run mode currently only works with standard 400m tracks. Many training facilities worldwide use non-standard distances (e.g., 350m, 300m tracks), making the feature inaccurate for these users. I train regularly on a 350m track. Track Run mode shows 400m per lap instead of the actual 350m, making distance/pace data completely wrong.

Proposed Solution: Add a "Track Distance" setting in Track Run configuration menu, similar to the existing pool length setting for swimming activities.

This would expand the Forerunner 965's usability to non-standard tracks worldwide while maintaining all existing functionality.

RE: Enable Custom Track Distance Settings for Non-Standard Athletics Tracks

pdurys — Sun, 07 Jun 2026 12:52:34 GMT

My observations and analysis of internal global track database shows that Garmin algorithm is ready for non 400m track length.

You can see those tracks for example:

Track Viewer (193m) or Track Viewer (295m) or here Track Viewer (198m)

Majority of tracks outside China has default 400m length even if in reality tracks are shorter like this one in Chamonix Track Viewer (I think it has 300m)

There are two problems:

1. If track is present in this database then it will be used regardless your calibration attempts. Your option is to use simple Run activity not Track Run. You could ask Garmin to update that, but my experience is that they will not do that.

2. I know how to modify that database and upload it to watch, but I am not sure if that is the right way. I mean if Garmin would not say - you have violated warranty terms or else. And I think (not sure about that) that each update might overwrite modified database with previous definition and you would need to repeat that upload process again.

Garmin algorithm calculate track by its centerpoint, lengths of straightaway and angle (azimuth)

When semicircle radius is null then it assumes 400m length otherwise that value is used to calculate "actual" lengths. See examples above.

There is one more interesting thing. Some tracks around the world do not have "standarised" oval shape like this one Track Viewer

I do not know if that has 400m but if yes, then Track Run can help to keep very accurate lap distance. At least at lane #1

If you are interested in more details, let me know.

RE: High aeroob activity

7093861 — Sun, 07 Jun 2026 04:06:08 GMT

Thanks for your help! Al the zones are good and I did a rease on the zones.i had contact with Garmin support and they had a quick look at my activities and they also find it strange that it won't adjust the High aeroob. They told me that they will start a investigation on it.

High aeroob activity

7093861 — Sat, 06 Jun 2026 05:08:28 GMT

Hi there,

The last few weeks my Garmin doesn't register high aeroob activities. You can see it in the activity but it doesn't show in focus load. I am pretty sure that I am training in high aeroob because it's in zone 4. Is the anybody experience the same problem and what was the fix.

RE: High aeroob activity

Luko79 — Sat, 06 Jun 2026 21:24:47 GMT

but are the zones correct? (on the chart in the activity there are time in zones, check the values) if you have autoMaxHR enabled and the watch measured a very false high maxHR, and you use zones with maxHR%, then it can be a problem because your zones are shifted up.

my opinion is that the optical sensor is good only for sleep and sitting, during sports or activities this has unreliable measuring.

Garmin Forerunner 965 Randomly Shutting Down on Firmware 27.09

6517627 — Sat, 06 Jun 2026 16:20:41 GMT

Hi everyone,

I'm using a Garmin Forerunner 965 with firmware version 27.09, and I've been experiencing frequent random shutdowns.

The watch sometimes powers off when I press and hold any button. It also often shuts down when connecting to Wi-Fi. However, the issue does not occur when the watch is connected to the charger.

Because the problem started on firmware 27.09, I suspect that this firmware version may be the cause. I've searched through many forum posts and tried reinstalling the software by pressing the Light button 8 times, but the watch remains on version 27.09, and the random shutdown issue continues.

Has anyone experienced the same problem? Is there any way to downgrade the firmware to a previous version, or are there any other troubleshooting steps I can try?

Thanks in advance for any help.[View:/cfs-file/__key/communityserver-discussions-components-files/786/27.09-error.mov:320:240]

RE: High aeroob activity

7093861 — Sat, 06 Jun 2026 15:25:17 GMT

Hi, I don't have a belt just my watch. But the funny thing is that it always register the activities but sinds a couple of weeks I doesn't. I didn't change anything on my watch.

RE: Enable Custom Track Distance Settings for Non-Standard Athletics Tracks

Jacquers — Sat, 06 Jun 2026 10:28:41 GMT

Post in the Fenix 8 section.

RE: High aeroob activity

Luko79 — Sat, 06 Jun 2026 10:11:50 GMT

i dont have such a problem, are the maxhr, threshold hr , resthr for the given sport correct? . and do you use HR belt or are you using the optical sensor?

RE: High aeroob activity

7093861 — Sat, 06 Jun 2026 08:54:13 GMT

By Heart rate

RE: High aeroob activity

Luko79 — Sat, 06 Jun 2026 08:42:19 GMT

zone 4 by hrm or by power?

RE: Enable Custom Track Distance Settings for Non-Standard Athletics Tracks

mirdoo — Fri, 05 Jun 2026 20:14:46 GMT

RE: Kadence SW.28.03 Beta

Garmin - AL — Thu, 04 Jun 2026 16:34:51 GMT

This forums page is for live software reports. Please create a post on the Forerunner 965 Beta page:Forerunner 965 *Beta

Kadence SW.28.03 Beta

4973139 — Thu, 04 Jun 2026 13:35:01 GMT

RE: Old bug in sun widget still not fixed

Bit — Thu, 04 Jun 2026 09:36:29 GMT

There are more use cases they don't test for or care about, unfortunately. The fixes seem to be the repeated application of "thread locker" ;-)