RALT-En-route Alternate

It is an aerodrome at which an aircraft would be able to land after experiencing an abnormal or emergency condition while en route. Such Aerodromes shall be indicated in Flight Plan (FPL) as ICAO four letter indicator(s) for enroute alternate(s), as specified in Doc 7910, Location Indicators, or name(s) of enroute alternate aerodrome(s), if no indicator is allocated. For aerodromes not listed in the relevant Aeronautical Information Publication, indicate location in LAT/LONG or bearing and distance from the nearest significant point.