The mercs will know as much or as little as the GM desires.
A sudden uptick in attacks by mechs/gear seemingly not associated with any known pirate bands has triggered the OA intelligence to investigate - you’re the investigators too!
The OA has complete information but the mercs don’t get it because the pirates have people inside the OA government who prevent the mercs from getting a complete data packet.
1. Well obviously. The point is no Merc unit takes a blind contract. You asked for input. One of the issues some are seeing is the desired scenario doesn't really match common merc contracts.
2. And I said this was possible. I also said the downside here for the OWA is that they are essentially hiring a Battalion for X# of Months of "Recon" that is the job of Spies IE.. a Platoon of infantry in total. Again, it begs the question of suspension of disbelief.
3. LOLOLOL. Pirates w/ funding enough for an undercover spy network. Now I'm laughing. Haha, that's good.
4. I'm not trying to argue, I'm trying to make your Mercs believable.
Saying the OA doesn't know enough about the planet of Antallos to give more than "Sarna" level of detail on what Cities are best to base out is very unlikely.
Building a Base in the Wastelands for a "Short" mission in "Enemy" Territory doesn't come across as realistic to me.
A Modular Base is something Wolf Dragoons (A divisional strength force) build on a planet (New Valencia / Fort Jamie) that is owned by their employer that they use for a 5 year contract to act as base for a massive unit of dependents.
Building even a small base to house 100-ish people with power, water, environmental sealing, hangers, command & control, all so they don't have to live out of the DS seems excessive for finances of a small merc unit.
A planet is a BIG place.
I question if a year is actually long enough for a single company of mechs to search/recon 30 different cities & the thousands of kilometers of wasteland to find them if they are going in blind.
It's not illogical at all to assume they have something as basic as this.
OA tracked them back to Antallos.
OAI Local assets managed to confirm they are entering/leaving out of the area East of the Shatter Wastes in the Broken Lands.
We have not been able to confirm what city they are closest to, in contact with, or getting supplies from.
Insert: Big packet of data showing the map from Sarna & a briefing on each of the domes, planetary history, environmental factors.
Mercs decide to base at the minor port of Lexi-con in the middle of the jungle well north of the Shatter Wastes (Broken Lands) since it has a small Sea/Space port.
Scouts will travel to the next 3 closest cities of Elburn, Volcano, & Hottown to gather intel & narrow down.
Fast forward...
No luck in Hottown but between Elburn & Volcano they do manage to get some more data to narrow down probable locations to begin searching the Broken Lands to the West.
Now the Fighters get involved for aerial recon so that the DS & Mechs can finally see some action.
I don't know where your PCs fit into this since you've said above that the PCs are not the Mercs & the Mercs are NPCs for your PCs to interact with.
I'm just saying the idea of Mercs being given a "go live on a hostile planet for a year w/o support from the Hiring nation & w/o the actual goal of conquering the planet or pissing off the locals enough to make them the enemy" order, that just doesn't seem likely to me.