Originally Posted by
Seattle Forrest
I've never deleted activities from any Garmin. Ever. I've done more than 200 activities this year. No downside to this. Where did you get the idea you have to manually delete the old ones?

From discussions in the Garmin forums.
aweatherall over 2 years ago
200 is the limit. It then start deleting older ones to allow newer ones to be created.
(aweatherall doesn't work for Garmin but has some sort of relationship with them. He's very knowledgeable.)
https://forums.garmin.com/sports-fit...ge-830-devices
Garmin specifies a limit of "200 hours" (but it doesn't seem to be hours). So, there's some sort of limit. If I recall correctly, the 800 had the same limits.
https://www.garmin.com/en-US/p/567991#specs
How many activities are listed on your device?