[Routing] Binary file format

[Adam Boardman]

> Yes, but this means that at high latitudes you are going to be looking
> at a very narrow band of a lot of very short fat tiles

Or tall and thin... but its by the by, WhereAmI is released, I've still 
got mad types trying to use pre v0.05 which is from before the OSM API 
break so wanting segments, all they download is three citys telling them 
to go download the new version, yesterday there were 30 failed 
downloads, from 18 individual ip's. I'm not going to go breaking things 
for zero gain.

> Err, 9mm, not 9cm.

Apologies I missread your 0.9cm... but I still see no advantage of 9mm 
over 11cm, both are too small for mapping purposes.

Cheers,

Adam.