Beinn Chaorach, 713 meters, P381.

Beinn Chaorach is the most southerly Graham of the Luss Eight Grahams.

Jim Bloomer thinks that spot with the 2 GPSs is higher than the trig point as seen with his Abney Level. An Abney Level is an easy to use, relatively inexpensive, and when used correctly an accurate surveying tool.

Jim Bloomer's prominence based website can be accessed here. Link.