Two stations, one measured baseline, two angles to a far target — that is all a surveyor needs. The law of sines turns them into a range: AL = b · sin B / sin C. This is how coastlines were first charted before any ship could reach the rocks.
But every angle carries error. Fog, a shaky tripod, a flickering light — here the bearings wobble by about 0.3°. Propagate that through the crossing and the fix isn't a point, it's an ellipse: area = π·σ²·r₁·r₂ / sin(crossing angle).
So the fix sharpens when the two sightlines cross near a right angle and the light is close. Squeeze the stations together, or push them both to one side until the rays run nearly parallel, and the ellipse smears out down-range — you know the direction, not the distance.
Modern GPS lives by the same rule: satellites in a tight patch of sky give a bad fix, the surveyor's dilution of precision. Geometry, not the instrument, sets the limit.
Something in the simulation stopped unexpectedly — the lesson continues without it. Nothing you did was wrong; you can move on.