Learn Traveller in Under 60 Seconds
- Thread starter CyborgPrime
- Start date
Astrogation: Traveller RPG Skills in 60 Seconds 
Watch here: 
Got any Astrogation examples with good and bad modifiers?
Commander Truestar
SOC-13
So, my players were on an "assignment" with multiple outcomes departing from the Regina system to the Arden system
The jumps to Extolay to Tremous Dex to Arden could have been standard.
But, Tremous Dex is a pirate den surrounded by a jump shadow of 24 Hours 45 min due to the world being in orbit of a Gas Giant.
So, giving someone over a day to "welcome you" to a pirate den being a bad idea, they decided to look for what is referred in the "Battletech world" as a "Pirate Point": a point in space where gravitic and other interstellar energy forces interact to cause gravitic null points in a given space.
These would be points which, when identified by an Astrogator, would allow them to plot a jump point "Within" the 100 D limit.
As in "Waaaaay" within the 100d limit.
So, using the best data they could get in and from the Extolay port started a task chain.
1) Get cooperation from Extolay port to get their most up-to-date data 2D6+Admin+ 1/2 Carousing(making port workers buddies)+ bonus for Charisma (a stat I use IMTU) - "Outcome Uncertain" Difficulty: "Average" to "Difficult" (use flux dice to decide)
2) [Optional] Get cooperation from other ship crews in Extolay port to get their most up-to-date data 2D6+ Carousing(making port workers buddies)+ bonus for Charisma (a stat I use IMTU) - "Outcome Uncertain" Difficulty: "Average" to "Difficult" (use flux dice to decide)
3) Determine an established point in the Extolay system from which to jump and plot a course to reach that point at Zero Vee:
2D6 + Pilot Outcome: Obvious Difficulty: Routine
4) Plot the jump with the following factors:
----A) Plot the location of bodies within the Tremous Dex system on which the gravitics and other factors depend:
2D6 + Navigation + (Between +2 and -2 dependent on the outcomes of 1 and 2 above) Outcome: Uncertain Difficulty: Formidable
----B) Identify potential null grav points in the Tremous Dex system to which a jump plot can be computed:
2D6 + Navigation + (Between +2 and -2 dependent on the outcomes 4 A above) Outcome: Uncertain Difficulty: Formidable
5) Hazards:
----A) Incorrect plot results from the process above: Initiate the GM's choice of Misjump, system failures on arrival, critical systems failures on
arrival or Misjump with system failures. (I once had my team face critical systems failures including life support WHILE in a misjump)
----B) Presence of unknown objects at or near the jump coordinates causing likely energy fluctuations that would blast the arriving ship with
energy feedback and failures (Severity up to the GM)
I can expand on this if this were not just off the cuff but I'll cut this short for now
Badenov
SOC-13
Is this different from a standard Lagrange Point mathable by anyone with current astrogational information? I can see that getting recent system data is important for current Lagrange Point navigation, you don't want to try to thread that needle using old data, and the path to that point can be kind of important, but I can't see it being particularly hard to obtain unless the locals tow moons around to change the points' location. The Earth-Sun Lagrange points are just outside the 100D radius of Earth, but it seems reasonable that there are Lagrange Points inside 100D depending on specific system geometry. (https://en.wikipedia.org/wiki/Lagrange_point).
Though it seems to me that ambient gravity would always pull you out of jump before you reach this null? Presumably there's a curve of equi-gravitational points you can fly into the Lagrange Point? That's probably something that changes rapidly over time as the planet orbits, necessitating the recent system nav data.
