Yes, Micromax Bharat 1 (2018) - known as Micromax V409 does have the Kannada language support.
Yes, Micromax V409 (Bharat 1 2018) does have the support for the Marathi language. You can change the entire phone's language to the Marathi. You can store contacts, write messages in Marathi, too.
Yes, you can browse Facebook easily with the help of pre-installed Opera browser of Micromax Bharat 1.
No. Micromax Bharat 1 V409 does not have the GPS support.
Yes, You can use Micromax Bharat 1 V409 has a wifi hotspot. You can use your 4G SIM card and can enjoy seamless internet browsing.