Originally Posted by
shelbyfv
The Wahoo computers pair with a phone to facilitate set up. They do not need to be paired while riding, though you lose a couple of "features." However, IME, the Wahoo app uses very little phone battery power.
This is more accurate if you state "The Wahoo's REQUIRE a smartphone connection for initial setup".
And as note, in addition to assorted Garmin Edge's, that do not need a smartphone to operate, the Hammerhead Karoo 2 does not require a smartphone to operate.
Typically though, both the Edge's and the HH can benefit from having a phone connection. Certainly many functions on Garmins related to downloading routes to the device or uploading completed rides, are easier to manage with a smartphone connection.