Many thanks Nick and Michael. I obviously need to do more RTFM. :)
I did some digging in the Help panel and found that there are several
out-of-date lists of iD shortcuts.
To get the Measurements panel to appear I have to press CTRL+I, not M,
at least in the Opera browser.
The scalebar is useful, but not very convenient to use as it stands. I
found that clicking on it toggles metres or feet units.
To make much use of it needs a pixel ruler. There is a free one at:
http://www.spadixbd.com/freetools/
which can be used horizontally or vertically (but not at an angle
unfortunately).
Using the scalebar and the pixel ruler you can calculate the essential
metric, which is metres-per-pixel at the current zoom. Which can then be
used to measure any element on the screen using the ruler.
cheers,
Martin.
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