General principles for constructing an internet access point using a homemade parabolic reflector, a 4G modem, and a feed antenna

WMM Point Calculation C++ console (based on C console) uses WMM's C DLL instead of WMM's 'GeomagnetismLibrary.c'

Free offline compass app for Android & iOS. True north with declination, magnetic interference detection, microtesla meter, Pin Direction bearing lock. Built with Flutter by lapnito.cz s.r.o. No ads, no tracking, no data collected. Digital compass, hiking navigation, magnetometer.

Use publicly available online services to calculate your magnetic declination!

Deterministic, verifiable ephemeris + geomagnetic computation — the physical numbers LLMs hallucinate, computed correctly and checked against NOAA & JPL.

Pure Standard ML geomagnetic field: spherical-harmonic Gauss coefficients to declination/inclination/intensity via Schmidt recurrence (MLton + Poly/ML)