This should hopefully help the planning along:

- Avastan Tactical.jpg (197.19 KiB) Viewed 417 times
A blue square is ~500m so the ships are somewhat overscale to aid identification.
Legend (starting in top left berm):
D Deliverance an ex Imperial 400ton Patrol Corvette
H Hawkwind An Empress Marava II class merchant
S Saxon 200ton trader paired with Deliverance
V The Viper's Nest a 400ton "Fat" Trader converted to an auxiliary carrier. Has suffered nine crew casualties ashore from Kit and the Iyhlua Clan.
D Drachenfels a 500ton Maru Class Merchantman/Corsair
A Abyss a 440ton Nishemani Class Corsair. Very likely to have suffered multiple crew casualties ashore from Red Angel.
N Nazareth 200ton trader paired with Abyss
M McClellan Merchant "Four Nine" a 400ton non spec trader owned by McClellan currently housing the
SEMC.
V Vargr Auxiliary Police Unit HQ vessel) suspected to be Raersthog (Revenge) a 400t Aeogz class corsair).
T (White ship Black T) Trader a 400t Civilian Trader
T (Black Ship White T) Trader a 200t Civilian Trader
Blue Dots are Stag Attack Helos with crews on standby
Brown Dots are Avastan Light Infantry sections (~ 10 men) in prepared positions (bunkers and trenches).
I'll repost the results of Freya's initial sensor work and other's observation and tactical appreciation:
Analysis of the sensor data (confirmed by your visual sighting and further Intel from Erica) reveals power plants consistent with what you are looking for together with a faint ghost return consistent with an electronically masked vessel and further power plants occupying the “berms” north of the runway.
So, west to east (left to right on the map) Deliverance (Patrol Corvette) plus a 200ton trader (so in the nearest berm to you), Viper's Nest (Fat Trader), Drachenfels (Maru Class), Abyss (Corsair) plus a 200ton trader (furthest from you nearest the Vargr).
Further tactical recon reveals that each fighting position on the berms' perimeter is manned by about ten Avastan infantry. This gives effective company strength or about 100 soldiers. They wear soft armour under their cold weather clothing and are equipped with ACRs and RPGs. The “Flak Towers” have 12.7mm HMGs for local defence and AA medium range missiles on their rooftop launchers. It would appear that another company mans the other/outer defensive positions on the downport with a further company in reserve/deployed elsewhere (likely Avastan City) which would amount to the entire Battalion strength defence force.