In reply to pancakeandchips:
The Suuntos don't seem to provide a proper Romer scale. They also have 1:24k and 1:65536 scales; those might be useful in the US, or with old UK 1":mile mapping, but not so helpful with modern OSGB mapping.
Bit of a shame, as, otherwise, they have a good reputation.
Silva Expedition 4 seems the most applicable to UK use, with multiple Romer scales.
Post edited at 22:55