If you are outside radar range...
or electronic signal absorption?
Turning back put it in a better place to be spotted initially. Flight westward across the IO is a place of admitted gaps in coverage and flight following.
In normal ICAO operations a flight is flown as filed or as cleared. Controllers than expect the flight to appear on their screen squawking the proper code, and contacting or answering up on the correct freq. Where the flight crosses many airspace divisions, the controllers hand off to the next guy for flight following.