It seems like this should be basic functionality.

Same for us in the UK, it's really frustrating that instead of allowing us to set units for different things we're locked into some kind of preset (more so when other places allow more flexibility). Can't be that hard surely?

Re-post of from fellow Candian Benny (=they say exactly what I want to say but the conversation is locked and the problem still exists):

Please add an option for custom measurement unit in the connect app setting (Android/iOS/Web). People are asking for this for more than 11 years : 
- Weight in pounds and distance in kilometers - Garmin Connect Web - Mobile Apps & Web - Garmin Forums
- Distance in metric, weight in pounds - Garmin Connect Web - Mobile Apps & Web - Garmin Forums
- Canada units and measurements - Forerunner 955 Series - Running/Multisport - Garmin Forums
- How to display Km and Lbs in Garmin Connect? : r/Garmin (reddit.com)

In Canada we use a mixed bag of both metric and imperial : (are we the only weird country out here?)
- Distance = KM
- Weight = Pound
- Height : Feet *mostly
- Temperature = Celsius

We already have this option in the watch settings why not add it in the mobile app?

Original (now locked) post: forums.garmin.com/.../custom-measurement-unit-in-connect-apps