Draw your plan once and take one compass reading. Every room is placed from that single number, corrected with IGRF-14 — so if the reading is out by a few degrees, the whole plan turns together and we can tell you which rooms that actually moves.
The eight sectors are the four compass directions and the four corners between them — Ishanya north-east, Agneya south-east, Nairutya south-west, Vayavya north-west — around the Brahmasthan at the centre, which is the one region that does not move when the plan turns.
Draw at least one room, or switch to typed bearings.