This tool calculates your Local Entry Arc. A wired Laser pointer requires this calculator, one that has a linear spread can be easier to align. These calculations are processed locally in your browser. Aqua Chroma does not store your coordinates; we only provide the mathematical offset required to anchor your node to the 0.0 Oceanic Datum.
Refraction is not a constant. As you move higher in elevation, the atmospheric density drops, changing the Incident Angle ( n1 ). To maintain an Emerald Lock, we must adjust the laser's entry to compensate for this thinning air.
We use 4 decimal places for Geodetic coordinates. This provides ~11 meters of accuracy—sufficient to distinguish your home’s "Metric Cell" from the street without identifying your specific doorway.