Let say you have a separate rotation for GB and IN traffic so you domain.com/en and domain.com/in pages. But traffic from India comes with "en " language in ACCEPT_LANGUAGE header and gets redirected to domain.com/en and that screws up stats for British traffic
You can use GeoIP redirects in Rotation settings so add
IN,BD|in
so all traffic from India and Bangladesh will be redirected to domain/in despite having "en" as a browser language.
GeoIP redirects
GeoIP redirects
Don't forget to run script update