Is Garmin APP available for triathlon?
Since the 645 doesn't have a native triathlon app, the link to this app in the IQ Store below is probably your best option. I've never used it, so I can comment on how well it works.
https://apps.garmin.com/en-US/apps/f85eec71-180e-4e0b-88b1-7cbe0dee9472#0
