I have found a good reference on how to best handle I2C cabling. It's a
PowerPoint Presentation from Texas Instruments, I made a screenshot of
the relevant image:
http://s7.postimage.org/t9bfk47hn/Screen_Shot_2013_02_08_at_11_00_03_AM.png
As I suspected, only one end of the shield gets grounded, individual
coaxes for SCL and SDA.
Google I2C cable issues.ppt to find the original document as the
first hit.
Now I have to source some extremely tiny minature coax, ideally with a
solid core (for easier soldering to the pads on the NavBoard and the
GTA02). Looking for recommendations, ideally something I can order from
Digi-Key, Newark or Mouser in smaller quantities (it's not like a need a
1,000 foot roll!).
It's not clear IF the power supply wires should be shielded. I think I
will try to see if it makes a difference for the GPS.
-Pascal
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