Hrm swim and instinct 2

https://onemanengine.com/garmin-hrm-run-dual-swim-tri-and-pro-compared/
hrm pro is compatible with Garmin connect app and have standalone monitoring

But Hrm-Swim is ANT+ enabled
have you tried pairing directly from watch?
https://www8.garmin.com/manuals/webhelp/GUID-31D23DBB-57C2-4DF7-A0C9-8D1A00AB4BE7/EN-US/GUID-0AA57B88-BA13-4983-ADAC-7EA7DABC735D.html

I dont own aby of HRM straps so I cant help further 

I don't own the hrm swim, I would like to buy it but the Instinct 2 does not appear among the compatible watches from the garmin website, while in the hrm pro yes. For use in the pool, I was therefore wondering what the difference was between the two cardio bands.

1140416 said:

Why is the heart rate monitor not compatible with the watch?

It certainly is. It is just not listed as compatible, since the HRM Swim is an old device, while Instinct 2 is relatively new. The list of compatible devices was likely not updated.

However, I'd rather suggest getting the HRM Pro anyway. HRM Swim does not support Running Dynamics, does not support standalone functionality, Intensity Minutes, all-day HR, Steps, indoor distance, ... HRM Pro (or HRM Pro Plus) is a much better device, for a small difference in the price.

In my opinion the list is up to date, there are models that have recently been released.  So either it is an error or it is not compatible

The HRM-Pro is the better option overall but it will move when kicking off the wall at the end of a length. It does not stay in place like the HRM-Swim. If I want to use my strap in the pool I wear a Tri top. 

The post on FB is mine. I used my wife's account. Indeed, the answer is that the watch is compatible. Unfortunately I still have the doubt, but it is my flaw, since in the meantime I contacted the garmin assistance service and they confirmed that the HRM swim heart rate monitor is not able, after the swim, to transfer data to the instinct 2. So I wrote an email to assistance but I have not yet received an answer, in fact, as shown in the faq link, they claim the opposite support.garmin.com/.../ 010-13118-00 & searchQuery = Swimming & tab = topics. I also offered myself as a tester :-)

It is compatible. I am using it for a few weeks without any problem. The HR data is automatically downloaded when the activity is finished and saved.

Perfect! Now I have to find the courage to buy it. Thanks for your feedback

Hello
I can't see the HR data on the Connect App

How do you use the HRM Swim with your instinct watch?

thanks

Stefano