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From: Kai-Martin Knaak <knaak AT iqo DOT uni-hannover DOT de>
Subject: Re: [geda-user] pcb_fprintf mixes mm and mils for same output object
Date: Wed, 27 Jan 2016 21:23:01 +0100
Organization: Institut =?UTF-8?B?ZsO8cg==?= Quantenoptik
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Stephan Böttcher wrote:

> Maybe, at some point the default unit can be changed from cmil to nm for
> unit-less numbers, 

There is a small but sometimes significant benefit to nm: Unlike centimil 
the nanometer is a unit sanctioned by the SI. If a project requires 
certification of some sort, non-standard units tend to raise an eye-brow 
or two during the audit. Think ISO-9001, ESA, health related products... 


> as long as old files with base cmil are recognized
> and read correctly.

Backward compatibility is a necessity to not make users revolt :-)

---<)kaimartin(>---
-- 
Kai-Martin Knaak                                  tel: +49-511-762-2895
Universität Hannover, Inst. für Quantenoptik      fax: +49-511-762-2211	
Welfengarten 1, 30167 Hannover           http://www.iqo.uni-hannover.de
GPG key:    http://pgp.mit.edu:11371/pks/lookup?search=Knaak+kmk&op=get