Step 2: the combined threat overlay

Here 'terrain' is airspace, not ground — Kaskilva's threat rings determine where it is safe to fly.

Applying §5.1.3 and §5.1.4: instead of OAKOC, you build a combined threat overlay of Kaskilva's air defenses.

Layer	Characteristic in this case
HIMEZ	Long-range SAM (SA-10-class) — coverage ring of roughly 150 km, spans the entire corridor
LOMEZ	Medium-range SAM (SA-8/Buk-class) — 35–40 km, concentrated around the two main airfields
SHORADEZ	Point defense around the GCI node and the primary airfield
Gap	A narrow corridor low over the sea along the northern edge, where the HIMEZ ring just fails to reach the coastline

Use the engagement zone widget in §5.1.4 to visualize this yourself: turn on HIMEZ and LOMEZ and show that the "gap" only exists at low altitude, right under the HIMEZ radar horizon — and disappears the moment Kaskilva could run a JEZ that lets the zones overlap.

Weather and space effects (§5.2.5)

The Baltic winter brings a low cloud ceiling and periods of moderate icing — this constrains both the attacker (minimum altitudes for CAS) and the defender (EO identification becomes harder, straining the JEZ combat-ID prerequisite). A planned operation accounts for that window.

Output of Step 2: a combined threat overlay identifying one candidate corridor — low, along the northern edge, time-bound to the weather — as the starting point for the threat analysis in Step 3.

§9.2 Step 2: the combined threat overlay