On Tue, Jul 7, 2020 at 8:25 AM Alex Goodwin <xxxxxx@multitel.com.au> wrote:
On 7/7/20 8:42 pm, Thomas Jones-Low wrote:
> On 7/7/2020 12:47 AM, Alex Goodwin wrote:
>
>> Does anyone have an idea when Jump maths advanced far enough to relax
>> the "must have significant mass at other end to lock onto" requirement?
>>
>     GT: Interstellar Wars mentions it in passing. It was one of the
> innovations of the Rule of Man. Trying to take advantage of the
> extended range of the J-3 Drive to get past a few of the smaller rifts
> in the Imperial spaces. I don't recall any specific date or person in
> the innovation.
>
>     I wouldn't surprise me it was discovered in a way to find a way
> across the Windhorn rift to suppress the repeated Vargr invaders to
> the coreward border, not understanding there was no concerted efforts
> by the Vargr to invade.
>
Thomas,
Thanks for replying - are you referring to the "Deep Space Jumps"
sidebar on p171 of GT:IW?

A quick shufti at GT: Rim Of Fire's history chapter doesn't turn up
anything on the relaxation, but 700 years (from ~2300 AD to ~3000 AD) is
a slightly nontrivial period of time and the 2I covered a slightly
nontrivial chunk of space. Especially since the timeline has gone boink
(aforementioned rogue gas dwarf, etc), I'll just have to figure out
which bunch of nutcases (or PCs, but I repeat myself) figure a way
around it.

As I recall from the IW playtest the question was the Imperium board game dis not allow deep jumps. You must jump from world to world. And this was done for game balance and scenario planning reasons. But it is the source of the “no deep space jumps" canon for the IW. 

Contradicting that is the original Terrian mission to Bernard Star. Where the team made several jumps to a deep space depot between the two. 

And during the FFW there was the battle of the two suns, where the Zhodani constructed a deep space base for military operations. 

So when the process was invented and when it became safe enough for general use is a question up for repeated debate. 

--
Thomas Jones-Low
xxxxxx@gmail.com