Top 20 NuGet rt90 Packages
You can translate both ways between coordinate systems: RT90, SWEREF99 andWGS84. The WGS84 object can parse out positions from strings in DMS (degrees, minutes seconds, and DM (degrees, minutes) format. All in all it’s a pretty easy to use and powerful library.
A small library with helper methods to convert between WGS84 and RT90/SWEREF. Also has utilities to calculate distances between coordinates.