Separate a navigation-system claim from evidence that it works beneath your actual canopy.
Check the evidence →Start with the part of your yard most likely to break the promise.
Coverage and app features are easy to compare. Navigation loss, slope, traction and passage geometry are the checks that eliminate expensive false fits.
Translate grade, traction and recovery paths into constraints before comparing headline slope numbers.
Map the terrain →Measure the whole route—not only the tightest gap—and compare it with documented clearance.
Measure the route →These guides organize decisions; they do not establish product suitability. Product claims and prices require current source review and a property trial.