[GTALUG] Surveying

[Stewart C. Russell]

On 2016-04-20 06:59 PM, James Knott wrote:
>
>> One chain is 66 feet,
> 
> Or 20 metres.

… if you're not fussy about 117 mm difference. Surveyors tend to be.

The only unit of measurement I know of that was deliberately designed to
be friendly for both metric and not-metric* is the HP-GL unit. It's 1/40
mm, or exactly 1/1016 inch.

 Stewart

*: there are so many variants that there isn't one brief useful term for it.