Grid tracking over centroid tracking
Positions sampled across a lattice of points covering your real service area, producing a map of where you are strong and where you disappear.
Measurement
If your rank tracker says you are third for a keyword in Chicago, that number is close to meaningless on its own. Local results change with the searcher's position, and in a city this dense they change over distances of a few blocks. A single citywide figure is an average of dozens of genuinely different results, and averages hide exactly the information you need.
This matters practically, not academically. Businesses regularly conclude that their SEO is working because a tracked number improved, while visibility in the areas they actually service got worse. The tracking was accurate and the conclusion was wrong, because the wrong thing was measured.
Proximity is one of the strongest factors in local search, so the same query genuinely returns different results depending on where it is typed from. In Chicago, someone searching from Rogers Park and someone searching from Hyde Park are fourteen miles apart and will see substantially different local results for an identical query. Neither result is wrong, and no single number represents both.
Most rank trackers report against a city centroid — one arbitrary coordinate standing in for the whole city. For Chicago that is usually a point in the Loop. If your business is in Portage Park, your tracked position describes your visibility to someone standing eight miles away in a part of the city you may never work in.
Positions sampled across a lattice of points covering your real service area, producing a map of where you are strong and where you disappear.
How often you appear in the pack across the whole grid, rather than a position at one point. A more honest summary of local visibility.
They are different systems with different factors. Blending them into one number obscures which is actually moving.
Rankings are diagnostic. If positions improve and enquiries do not, the tracking is measuring terms that do not produce business.
Personalisation and search history influence results, so your own searches for your own terms are among the least reliable data available — Google knows which site you visit constantly. Device type changes results, and mobile and desktop can differ materially for local queries. Results also fluctuate day to day through ordinary algorithmic variance that has nothing to do with anything you did.
The practical consequence is that a single-day change of one or two positions is noise and should not prompt action. Trend over weeks is signal. A great many agency reports are built on the noise because week-to-week movement produces something to put in a report, and this is worth knowing when reading one.
Grid-based local visibility across your genuine service area, so you can see the geography of your performance rather than a single figure. Organic positions tracked separately from local pack positions. Both presented as trends over weeks, with day-to-day movement explicitly treated as noise rather than news.
Alongside that, the numbers that actually matter: calls, form submissions and booked work attributed back to source. Rankings are how we diagnose what is happening and where to work next. They are not the product, and an agency that reports positions without connecting them to enquiries is showing you a proxy rather than a result. The question a report should answer is whether the business got more work, and a position chart cannot answer it.
Straight answers
Start with a clear read
A free analysis including grid-based local visibility for your real service area, not a single number from a point downtown.