Experts have been called in to determine whether two mountains in the Highlands can be called Munros.
Scotland currently has 284 Munros
Ordnance Survey maps put both Beinn Dearg, north of Glen Torridon, and Foinaven, near Rhiconich, Sutherland, at a height of 914 metres (2,999ft).
But for a mountain to achieve Munro status, the peaks have to be in excess of 914.4 metres (3,000ft).
Land surveyors CMCR Ltd were called in by the Munro Society to prove the actual height of the mountains.
The move came after Ordnance Survey experts were unable to say from their records whether the mountains' peaks had been surveyed accurately enough to state they are below the required height.
The Scottish Mountaineering Club, which has published the Munro's Tables since 1891, will not alter their tables unless it is confirmed that the mountains meet or exceed the required height.
CMCR, based in Larbert, near Falkirk, will now use high-tech equipment to prove once and for all the exact height of both peaks.
Company director David Corfield told BBC Scotland's news website: "When we were approached about this I thought it might be an interesting project to do and one which would give our surveyors a challenge from their normal work.
"What's exciting is that we don't know what the answer will be until we get up there and get the measurements. Depending on what we find - we could be responsible for helping find two more Munros.
"But of course that then means that all these people who can claim to have climbed all of Scotland's Munros will have more work to do."
Two surveyors from the company, along with members of the Munro Society and various mountaineering clubs take the measurements of Beinn Dearg on 21 and 22 April and Foinaven on 12 and 13 May.
The Munro Society was formed in 2002 and has over 3,000 members who have climbed all of Scotland's current 284 Munros.