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The DeWalt that I've been using recently had a bright green line pencil thin, in the sun, easily ten meters from the device. That's far enough to do an entire patio - ten meters in each direction. I don't know about longer needs, such as sidewalks, but for building construction the DeWalt was excellent.

I've never tried other brands.



the really serious guys use GPS based equipment, and its serious stuff, being able to center up on a 1/64 inch brad tacked into the asphalt.

[that 50,000$ ufo on a tripod by the highway, dont try to steal one, man do they ever know exactly where they are]

yeah i like team yellow too :) the beam spread is what you want to check out if your serious about > 100 ft distance

https://www.gpsalaska.com/

^ this is a very commercial website, but example of higher end equipment and technique


How do you calibrate the GPS


there is a sattelite network, and a terrestrial reference station infra


Yeah but how do we know there distances accurately


usually laser ranging is used to establish a baseline, rather than using a theodolite and chain like OG surveyors.

the rest is trigonometry, withe the GPSS defining points relative to the baseline.

https://www.gps.gov/trilateration

https://apps.dtic.mil/sti/html/tr/ADA165932/index.html

https://app.studyraid.com/en/read/15241/528230/determining-d...




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