Vimo Swim Tempo
Garmin watches ignore external cadence sensors inside swim profiles. This data field fills that gap: it connects to your Vimo over Bluetooth and records its tempo into the FIT file, second by second, right inside Pool Swim.
Needs a Vimo Swim tempo trainer. Without one in range the field only shows its connection status.

What lands in your activity
A real swim
Vimo tempo, strokes per minute
Heart rate
Both lines come straight from the FIT file the watch recorded. In Garmin Connect they show up as charts of the activity.
How it works
Set it up once, then just swim.
Install
Get Vimo Swim Tempo from the Connect IQ Store, in the Connect IQ app on your phone.
Add the field
On the watch, put the field on a data screen of the Pool Swim activity.
Swim
Turn on your Vimo and start the timer. The field shows the live tempo and your gap to the beat.
Look back
Open the swim in Garmin Connect, or in My swims on vimoswim.com, and see how well you held it.
Honest underwater
Works on