Exactly. If you want to handwave it, you can couple it to the volume-based nature of the jump bubble version of jump H2 usage. There's a threshold at 100dt below which you can't form a reliably stable jump bubble around a craft.

On Sun, Feb 14, 2016 at 12:03 AM, Kelly St. Clair <xxxxxx@efn.org> wrote:
On 2/13/2016 11:22 PM, Greg Chalik wrote:

On 13 February 2016 at 14:26, Craig Berry <xxxxxx@gmail.com
 <mailto:xxxxxx@gmail.com>> wrote:

    It's well established by canon that 100dt is the lower boundary on
    what can enter Jump.


​Why?

Its the start of 21st century and we can 3D-print a fully-functioning
jet engine the size of a microwave oven.
Why can't at TL15 the IN not produce some way of tracking their ships
backwards in Jump space?
I'm having a real hard time accepting that in a TL15 world, travel works
based on 17th century concepts (its not even Lord Nelson)

You've already been told:  Because Marc (and the LBBs, and all the Bigger Not-Black Books since) say so.  There's really not much more reason nor logic to most of the OTU than that.  You either accept it, or go play something else.  (Or have a psychotic episode.)

--
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Kelly St. Clair
xxxxxx@efn.org

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Craig Berry (http://google.com/+CraigBerry)
"Eternity is in love with the productions of time." - William Blake