Not sure what someone may have written for the 6S as a Connect IQ app, but the AB solver is only available as a built-in app on the Tactix Delta Solar with Ballistics (and the Foretrex 701).
Doc reached out to me about this thread.
He is correct that this should have been resolved months ago. We've tested both 2400 BDX and 3000 BDX with the latest firmware from both companies and have not encountered any issues. Garmin released a new Foretrex 701 update this morning, but it has...
Not ALL the environmental data needs entered manually. The Foretrex has built-in sensor for station pressure. Garmin also has a Tempe sensor for temperature (it's cheap, like $29 IIRC). Only think missing is wind and humidity.