It's designed for running, but that shouldn't really prevent it being used in multisport activities. I don't have a multisport capable watch myself, but a user has reported that when my data field is used in multisport mode, it causes the Garmin Connect activity to appear blank.
e.g.
- A running activity created with my data field on a Forerunner 735XT
https://connect.garmin.com/modern/activity/1553960911
Everything looks fine, you can see the additional IQ graph and data - Two activities created in multisport mode with the data field (again, FR735XT)
https://connect.garmin.com/modern/activity/1553950709
https://connect.garmin.com/modern/activity/1553963598
The stats data and graphs (speed, HR, etc) are all missing - cf. a multisport activity from the FR735XT without the data field
https://connect.garmin.com/modern/activity/1500194726/5
Stats data, graphs all look fine
Has anyone else seen this problem? Garmin aware of it? It looks like a bug to me.