Manual

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6.3.32. If you see in the table some empty cells or marked yellow/red, it is an
indication that distances between Some beacons are measured inconsistently
or not measured at all. Try to re-position them because usually there is an
obstruction of some sort in the between the beacons. If you have any problems
– check Table of distances chapter
6.3.33. Make a service zone, clicking on the map with Shift + Left click. See
Submaps chapter for more details
6.3.34. Freeze the Submap by clicking the button. Stationary beacons will stop
measuring relative distances and will be ready to measure distance from the
mobile beacon(s)\