Each tab a screenful: the sky plot beside the fix; the bars with a fixed
dB-Hz scale and the constellations; and Details with whatever else the
receiver reports (correction, locator, course, DOPs with their rating,
signal averages, NMEA counts). Sim: sim_open("gps").
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>