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Is it a Corbett?

Since the lists of Munros, Corbetts or Grahams were first published there have been many revisions as more accurate OS maps have been produced. Accurate surveys, sponsored by the Munro Society, have probably settled all doubts at the boundary between Munros and Corbetts, but there are still likely to be a number of promotions or demotions between Corbett and Graham status.

The problem is highlighted in the case of a peak which appeared in the first draft of this guide but has now been excluded; Beinn Talaidh on Mull. When the OS 1:50,000 maps were first published, Beinn Talaidh was listed at 762m, the minimum height for a Corbett. Later editions listed Beinn Talaidh at 761m and it was relegated to Graham status. However, the latest OS 1:50,000 map shows Beinn Talaidh as a confusing 761(763)m. The OS seem to be doing this when the trig point is not the highest point on a summit. John Barnard and Graham Jackson in 2009, using sophisticated GPS equipment, measured the highest point as 761.7 ±0.1m and this height has now been accepted, missing the requirement for a Corbett by about 30cm (1ft). Barnard and Jackson believe the 763m may be a mistake by the OS measuring to the top of the large ‘prehistoric tumulus’ which is nearby. Incidentally, the author’s measurements gave a reading of 766m which is the same reading as he got for nearby Dun da Ghaoithe which is listed at 766m!