You may need to go to skyvector.com and punch in the waypoint code in the small box in the top left of the screen, then hit go.
Otherwise,… try this.
skyvector.com/?ll=8.121590994870 … 304&zoom=5
GIVAL and VAMPI are bottom right. IGREX is top left. Use the zoom.
Again, my question is… are GIVAL, VAMPI and IGREX on the routine flight path to Dhaka from Kuala Lumpur? This specific aircraft flew KL to Dhaka on 5 March.
For US flights, Flightaware lists the waypoints and routes for a scheduled flight, but I don’t think this facility works for flights outside USA.
If there were a catastrophic incident on the flight deck ,explosive decrompression through the windshield for example, was the last gasp engagement of a stored (previously flown) route in the 777 Route Manager, the last action of the crew?.