the.com/coverage
The map of what's protected, drawn precisely large enough to exclude your exact emergency.
means The extent to which something — insurance, news, a signal, a topic — actually covers what it claims to.
from From 'cover' (Old French 'covrir,' to conceal or protect) plus the noun suffix '-age,' meaning the act or result of covering — first stretched into insurance jargon, then news, then everywhere.
Insurance rootsOriginally meant the literal scope of a policy's protection.
Signal senseCell bars promise coverage you discover only by losing it.
News usageOften measures attention, not accuracy or completeness.