My own rules RE jump rutters, etc, from a couple of years ago:
"In Mongoose Traveller, using the Astrogation skill to plot a Jump is normally an Easy (+4) Education check, modified by the Jump distance (so, -1 to -6). It effect this means that unless the attempt is rushed along it is probably always going to succeed. In ProtoTraveller the idea is that travel is somewhat dangerous. Think more like world travel before the advent of flight – maybe not as dangerous as the Middle Ages, but more in the nature of the 18th or 19th century.
So, let’s say that those rules (mostly) apply to well-mapped trade routes (we’ll get to that in a moment). It still doesn’t cover Masking and Shadowing – and here is the simple fix. For Jump Shadowing add a -1 Modifier for every star in the system while for Jump Masking, when plotting the Jump simply add a -1 modifier for every system that the route intersects.
Normally, Jump takes 148+6d6 hours. In the event of Jump Shadowing, if the navigator doesn’t wish to take the Difficulty penalty then instead add +6d6 hours of travel for every modifier for the Jump Shadowing that they wish to avoid. This represents them targeting a point further and further out to avoid the Jump Shadow – though at the expense of longer and longer in-system transit time.
Now we can also say that plotting a Jump to a Backwater system (off the Trade Routes)in the Core Worlds is a Routine Education check the same as Frontier systems on Trade Routes. Backwater systems in the Frontier are a Difficult Education check while truly unknown systems are Very Difficult Education checks to plot a course to.
This also has the effect of channeling travel around “dangerous systems” and towards “safer systems” – essentially “rocks, shoals, and reefs” for the Traveller system. That’s before we add in other potential effects for nebula, black holes, etc. It also means that you can really create “hidden bases” or “protected systems” because certain systems are just a huge pain in the ass to get to."
Additionally,
"I like this because it dovetails with the idea of the “Jump Rutter” – perhaps there is some way to model very, very slow calculations that don’t use the Generate program but instead involve laborious calculations with the normal computational power of the ship’s computer but sans the specific algorithms and database that the Generate program contains. It also suggests the existence of a psychic talent that allows instantaneous Jump Calculations ala the Pilgrims from Wing Commander.
Given the default anti-psionic attitudes inherent in the RAW, this creates a couple of interesting potential plot points immediately…
So, using a Generate program, creating a Jump Plot normally takes 10-60 minutes, we could simply say that going by hand, using a Jump Rutter, takes two time increments of time slower, or that it takes 6-24 hours (hmmm… I think that table might mean 6-36 hours instead….) instead and is a Formidable task (an additional -6 to the roll). So, you can pay for a Jump Cassette, or pray that the Astrogator is as good as he promised when you hired him…"
Personally I've always liked the idea of Jump Rutters, which coincidently makes Navigator very, very important. If I was interested in crazy levels of verisimilitude I'd probably include familiarity with the ship model (or size) as well but that seems like it would drive most people crazy...
D.