Great Trigonometrical Survey

The Great Trigonometrical Survey was a project which aimed to measure the entire Indian subcontinent with scientific precision. The actual work of trigonometrical survey commenced on 10th April, 1802 by measurement of base line near Madras by Colonel William Lambton under the auspices of the East India Company.

The GTS marker for Margao is placed at the entrance of the Margao Municipal building.