If two astrologers have told you contradictory things about the same city, there is a decent chance they were not using the same technique.
What astrocartography does
It asks one narrow question — where on Earth was each planet angular at the moment you were born — and answers it for the entire globe at once. The output is a map with lines on it, and the lines mark the longitudes and curves where a planet was rising, setting, overhead or underfoot.
That narrowness is the point. It is a filter: it takes eight billion possible addresses and hands you a few dozen regions worth thinking about. It says nothing about anywhere that is not near a line, which is most of the world, and that silence is a feature rather than a gap.
What a relocation chart does
It takes your birth moment — the same instant, unchanged — and recalculates the entire chart as though you had been born at a different set of coordinates. The planets stay exactly where they were, because they were where they were. What moves is the house framework: the Ascendant, the Midheaven and every house cusp derived from them.
The result is a complete chart you can read the way you would read any chart, for one specific place. Where astrocartography says *there is a Venus line here*, a relocation chart says *in this city your Venus falls in the seventh house and your Saturn on the Descendant, and here is what the tradition makes of that combination*. It is far more detailed and it only works one city at a time.
Why they seem to disagree
They frequently don't, and the appearance of conflict comes from comparing different resolutions. A city can be nowhere near any of your lines and still produce an interesting relocation chart, because houses shift continuously as you move east or west, while lines only exist where a planet hit an exact angle.
The genuine disagreements come from the choices inside each method: which house system a relocation chart uses, how wide an orb the map allows, whether minor bodies are drawn at all. Those are practitioner decisions, not facts about your chart, which is worth remembering when a reading is delivered with more confidence than the method can carry.
The order that actually works
Lines first, charts second. Use astrocartography to get from everywhere to a shortlist, because that is the only one of the two that can look at the whole world in one go. Then cast relocation charts for the three or four places that survived, because that is the one that can tell you something specific about a real address.
Doing it the other way round is how people spend a fortnight on a beautiful relocation chart for a city they were never going to move to. The map is for narrowing. The chart is for deciding. Neither of them is for skipping the part where you visit.