Version mkgmap-r3353 was committed by steve on Thu, 20 Nov 2014
Improve ConvertFilter.
The patch allows for length conversions between m, km, mi, ft and
speed conversions of km/h (kmh, kmph), mph, knots. New ones can easily
be added.
It will also take into account any unit that already exists.
So for example if you have ${val|m=>ft}
Then val will be assumed to be in meters if there is no unit.
val=10 --> 33
if a unit is given, then it converts from that, so if already in feet
the value will be unchanged.
val=10ft --> 10
val=10km --> 32,808
If it can't work out what to do then the value is unchanged.
http://www.mkgmap.org.uk/pipermail/mkgmap-dev/2014q4/021995.html
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