Coriolis is set in the Third Horizon, a complex of star systems linked by portals that enable instantaneous transport between connected systems (with severe potential complications). Each system is linked through the portals to perhaps 2-4 other systems, so traveling to distant systems requires passing through multiple portals. Portals are all located in the same place, about 0.5 AU from one of the system’s stars, so when you emerge from one portal you are 0.5 AU from the star and at exactly the position you need to be to go straight back through and on to your next destination. Navigating through a portal is dangerous, and requires piloting skill checks to pass through successfully; failure can be very bad, and as a result most travelers pass through in convoys, sharing the portal data provided by bulk haulers which pay extra to access good quality navigational data. No human can travel through a portal without being in stasis, so any ship that travels between systems needs to have enough stasis pods for its crew; failure to go into cryosleep during transit is always fatal.

This creates obvious complications for communications in the Third Horizon, particularly given that many systems have very low populations, are wracked by war or chaos, and have little industry and even less reason to visit them. As a guide, in the System Generator the largest population you can roll up for a whole planet is millions of residents. The systems have low populations that may be scattered across very large planets on very low density population centres. Given this, it seems likely that most systems will not receive much in the way of communications. However, the rulebook gives little information about this issue. All I can find on communications is this tiny inset:

Communication waves travel at the speed of light, which is roughly one AU per eight minutes – thus, getting a reply to a question takes at least 16 minutes per AU between you and the other party. No communication waves can pass through portals. Instead, a ship or a probe must make the jump and then transmit the message on the other side. This leads to great communication delays between systems. The Bulletin keeps multiple probes ready on every portal station, and anyone can pay to use them to send information. This is both expensive and not without risk however, as you never know who might be listening on the other end

This does not give much information about how communication works in the Third Horizon, and I don’t like it for two simple reasons:

  • If you have to pay to send information by a probe, then almost all information from low population centres will never get sent. I don’t like this.
  • It suggests that spaceships with no human crew can pass through portals. I really don’t like this idea: it opens the way for AI fleets, or for automated cargo systems. Not cool.

So, I have decided to revise the communications systems in the Third Horizon by introducing two small house rules that make life a little more complicated:

  • It is very dangerous to freeze and thaw people repeatedly from cryosleep – typically ship’s crews need a few days’ recovery before they can go back into stasis, and repeatedly violating this guideline can lead to insanity and loss of mental function (particularly bad when the security team wakes up in a rage, or the pilot has to navigate a portal in a post-stasis haze)
  • Any path through a portal requires a human to calculate it in order to work. In the entire history of the Third Horizon, no computer has ever plotted a path through a portal successfully. Most scientists suspect this is because the Portal Builders were capable of designing AI ships, and built this failsafe into the portals to ensure no one could obliterate another system using AI fleets

This has important consequences for communications in the Third Horizon. In particular, it means that it is not possible to have a system of automated relays, where probes go through the portals every hour and broadcast information, essentially rendering communication nearly instantaneous throughout the Third Horizon. If probes were possible, then it would be possible to have probes that transport through a portal every hour, collect the latest information broadcasts, and then transfer back through. This would mean that if you were 15 systems away from Kua you would likely get your news from Kua within about 24 hours, since when the probe comes through the portal it can broadcast its information directly to the portal station, and then when the probe to the next system is ready it will be right at the portal so will receive the information as soon as it arrives in-system, and an hour later travel to the next system. If probes were possible the Legion could send a message from Kua to the end of the Third Horizon in a matter of hours, simply by dispatching a probe through a series of portals.

If, on the other hand, only humans can pass through portals and humans require some days to recover from stasis, then sending information becomes trickier. At a busy system like Kua you could still have daily or hourly information exchange, simply by having a large enough number of small ships. For example with seven class I ships capable of stasis, you could send information through to Altai on a daily basis, using a roster to ensure that once a ship has passed through the portal its crew can rest and do other tasks for a few days before passing back through. But in a less busy system such a proposition might not be worth it – news would only be generated slowly, and no one would care what it was anyway, so why would you have seven crews on standby to transfer it? Instead you might broadcast it to a passing bulk hauler once a week, as the hauler passes through, and pay a nominal fee for it to transfer the information to the portal station at the far side. Then that station would pay a nominal fee to the next passing bulk hauler or starship to take information to the next system, and so on. In most cases this would mean that news would travel from one system to another approximately once a day, except in the busiest systems, so that if you lived in the outer fringes your news would take a week or two to get to Kua, and a month or two to travel to the far side of the Horizon. Given the distances involved that’s pretty cool.

This system of broadcasts will only apply to general news, of course. If you want a message sent to your family saying you made it safely to Yastopol then this is your plan: you go to your local Consortium office and select a simple, low cost plan to send your data to your family in Aiwaz, and you have fair confidence that it will arrive in a matter of about 10 days, give or take, uncorrupted and probably unread (let’s face it, you’re pretty boring). But what if you want to sext your lover in Kua? Or send news of a successful kick murder in Dabaran? Then you need more secure and more reliable delivery (you want to be sure he receives that dickpic!)

In this case you may need to provide your own encryption services, and people may be waiting at the other end to capture your data. When a bulk hauler arrives in a system it doesn’t ask questions about who should receive what data: it broadcasts it in bulk to a local receiver and carries on its way, and then that local receiver broadcasts that data on subject to the conditions of the transit. A cheap data transit plan will mean that stuff is just broadcast at every planet in system without fear or favour, and anyone listening in can pick it up. Local data providers will pick it up for sure, and if they recognize the address you gave your dickpic will end up at the correct tabula. But anyone who wants to listen in can also pick up your message, and if the encryption protocols of your backwater farmer’s Grindr app are not suitably good, then now everyone knows precisely how second rate your junk is. Probably not an issue, since the dude you were sending it to has already moved on (sorry to tell you that, but you know what these Kua boys are like – sluts the lot of them). If your news is a successful kick murder, though – well then your data is valuable, and whoever was sifting through your messages is going to be making sure to sell that on.

To get around this you have a couple of choices:

  • Pay for a packet drone, which detaches from the hauler once it arrives in the destination system and travels to a pre-determined local high security data center, from which its message can be broadcast with high security
  • Pay specifically for a tight beam communication to a specific target, which avoids the risk of interception but also leaves a trail of comms from ship to planet that an investigator could find
  • Apply your own high level encryption so even a widebeam broadcast can’t be hacked
  • Pay a secure provider – a dedicated information broker – which passes through some systems regularly and ensures your message gets to its destination, and usually also deletes its records after it passes through

Not all of these options are available in every system, or you may have to wait a long time to get the one you want. That dickpic won’t be fresh if you wait forever! Sometimes no matter how much money you have – or how many people you kill – the thing you need just won’t arrive in the system, and you’ll have to settle for less secure and less reliable communications. That is the nature of life out on the edge of the Horizon. Now let us consider two specific examples.

Banu Delecta’s Red Packet

The Cyclade is coming and as always at this time Dr. Banu Delecta’s thoughts turn to Qamar, a courtesan whose company she often enjoyed while she was a student in Coriolis. Dark-skinned, muscular, graceful, shy and ohh-so talented, Qamar was a boon to her during the stress of exams and a relief during those times when her male peers were exhausting and her rich boyfriends disappointing, and if his plebeian upbringing occasionally showed what did she care? He never judged her for her rich background, but loved her for who she was (really! She was special! Not like those old matrons from the Spire that he so often had to entertain!) Qamar retired after she graduated, but it is tradition in the Third Horizon for rich patrons to send retired courtesans a red packet – a small donation of money – on their birthday, as a kind of reminder of their goodwill and also to ensure that the courtesan’s retirement is not too harsh on them. Ever a stickler for tradition – and misty-eyed at the thought of those lazy afternoons in his apartments near the Ozone market – Dr. Delecta remembered that Qamar’s birthday was just after the Cyclade and now, back in her home system of Sivas, she had best organize the delivery.

A red packet delivery is no big deal, and so she takes a lifter down to her local post office and organizes an interstellar plan (oh how inconvenient! Back on Coriolis you could do all this on your tabula). She pays a little extra to ensure it is delivered on the date she chooses – Sivas is only two portals from Kua so she is confident it will arrive in time – and also pays a little more to add some encryption to the packet, since it is money she is sending. She does not fuss herself about choosing an extra-secure delivery method that would, for example, guarantee no one knew the recipient, since as far as she knows there is no evidence Qamar used to be a courtesan, and no reason to connect her to anything untoward, so it is unlikely that anyone will notice a birthday present as an unusual event. She presses the button and her red packet is broadcast to a passing bulk hauler, which will leave in three days for Altai. From Altai there is likely to be a bulk hauler convoy every day, and so her message will arrive in Kua within five days. From the portal station at Kua it will be broadcast to Coriolis, where – provided Qamar has not changed his number – the communications system will ensure it reaches her delicious former entertainment.

The message arrives in time, but Delecta has set it to arrive only on the occasion of Qamar’s birthday. Five days after the Cyclade and 10 days after she sent it, Delecta’s red packet arrives on Qamar’s tabula. By now Qamar has married, a nice dockworker, and the two of them live in a charming apartment near the Spring Market, Qamar’s husband unaware of his past as a courtesan to the rich and lazy students of the Academy. Of course Qamar lied to Delecta about his birthday (and his name, and how much he enjoyed her company …) but still he has had to set up a separate, private list of former clients, and remember to disable notifications on his tabula on this day, lest his new husband see a sudden cascade of red packets all arriving on the same morning. This year, just as last year, once his husband has departed for the docks, Qamar checks his messages and looks at the long list of red packets in his inbox. He opens Delecta’s, considering once again the possibility of blocking all of the former clients on his secret list. But then he sees the amount Delecta has sent him (he does not bother to read her sweet message), and decides that no, perhaps he will think about blocking them next year …

Dr Wana finds an artifact

Dr Wana, famous architect whose reputation is known across the Third Horizon (at least among people who matter) has been working a dig in Ghodar for 3 months, and on a harsh and stormy morning in the Merchant she and her team of students uncover a haul of Portal Builder remains. It is unfortunate that Al Hama does not survive the discovery, but archaeology is an exacting science which occasionally demands its sacrifices, and let us be frank – better it were Al Hama, untrained and undisciplined, than Wana herself. After the initial excitement and tears (not Wana’s) have passed, she prepares to send a message to her funders on Zamusa. This is a slightly complex situation, because her funders would prefer their identity were not known to passersby – indeed Wana herself is uncertain as to who they really are – and she needs to find a way to get this information to them that does not link them in any way to her.

Unfortunately information brokers are not common on Ghodar, out here near the edge of the Third Horizon. Indeed out here even bulk haulers are infrequent. She speaks to her data djinn and organizes a message with wicked encryption, to be sent wrapped in a triggering condition. Three days later a bulk hauler passes through and receives the packet, taking it on to Dzibann, where it waits for four days before being broadcast to a fast merchant heading inward. Unfortunately the portal at Dzibann is unstable and the ship is cast out again after two days; it then rests for three days before trying again, so the message reaches Errai after 12 days. At Errai the message is broadcast across the system, where it is picked up by a data broker and the triggering condition is read. Here the broker discovers that she will be paid 1500 birr to ensure that the message contained within is sent to a specific person in Aiwaz. This is easy profit, since Errai has regular bulk haulers and she knows in particular one she trusts; she sends it on two days later for a small fee and pockets the huge profits, sitting back on her cushions in her small apartment to applaud the stupidity of scientists (if only she knew what Wana had found!) The message is transmitted to Kua, where it is broadcast directly to the contact person Wana had nominated. This person, a shady data broker by the name of Oleagi, reads further instructions, repackages the message in a data probe, and sends it on; he takes his payment directly from Wana’s prodigious array of grants at the Academy. The data probe speeds to the bulk hauler Aurora 3, which picks it up and carries it as far as Awadhi through two portals over three weeks. At Awadhi the data probe is released, broadcasting its message to the portal station. From here the message is broadcast again to passing bulk haulers, and arrives at Zamusa 5 days later. It took a total of 40 days to cross the Horizon from Ghodar to Zamusa, and delivers very pleasing news to Wana’s funders. In the process it has been through multiple changes of sender, including a physical transfer of information, and it is highly unlikely that anyone will learn who sent the message unless they either hack the message, or intercept the data probe – which would require attacking the bulk hauler that carried it. Wana is certain the secret of her Portal Builder artifact is safe for now.

Conclusion

My preference is to have interstellar campaigns be a little like colonial era exploration, with information passing at the same speed that people do. This is a crucial component to keeping the PCs ahead of the law, and it is also a really useful tool for making the frontiers lawless and dangerous. If information takes weeks to travel the PCs can get up to mischief and move on, and by the time they return to somewhere that knows of their crimes their crimes are already old news; the same applies to their enemies. It also lends rumour, stories and gossip a stronger value, and forces the PCs to sleuth around. In such a setting information gets fragmented, and important facts go missing. In a system where probes pass hourly through portals and broadcast information automatically, information spreads at the speed of a fax machine, which is too fast to allow the PCs to stay ahead of the law and ahead of their enemies – and too fast to allow the rims of the system to fragment and break away from the center. This is why I have decided to change the rules for communication in the Third Horizon, and to make it more wild west. In this communication system the PCs will think they’re so far ahead of their enemies – and won’t know when they’re being chased. And that’s exactly how I like it.