Question

what is the reference system of India and adjacent countries
Series (IAC) and how is this numbering system relevant to Bhutan?​

Answer 1

Explanation:

For India and adjacent countries (except China) Everest-1830 ellipsoid is used as reference datum. Everest-1830 is a topocentric reference surface with its origin at Kalyanpur in M.P (Nagarajan, 2001). (Latitude 24° 07′ 11". 26 and Longitude 77° 39′ 17".