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A session loaded one airport's frequencies once, at the start, and never revisited it: on a departure the destination's tower never appeared however close you got, and every listed station worked from any distance. Two separate questions, kept apart. Which airports are *on offer* — both of them, always, since hiding one would stop a pilot dialling ahead — with the one belonging to the current phase marked primary. And which stations are *reachable*, which is line-of-sight from height: the standard 1.23·√ft with the ground antenna's own horizon added, checked against the tests' textbook figures at 1000 ft, 10000 ft and FL350. The governing constraint is that the software has to work with no bridge connected, which is the normal case for someone practising without a simulator. Position is therefore an enhancement, never a requirement: without one, both airports are offered and nothing is marked unreachable, because a station that cannot be *proven* out of range must not be taken away. The phase decides which airport leads instead.