GPSy Pro for Mac

From Global Mapping Systems:

GPSy Pro is an enhanced version of GPSy, our award winning GPS and mapping software for the MacOS. GPSy Pro was designed for boaters and peoplewho use large or complex map images and adds the following features to GPSy: BSB topographic and nautical chart format support for African, Canadian, European, German, French, German, Swedish, Swiss, and U.S. territorial waters (see GPSy Map Page). Internet DGPS Support -- uses the free internet DGPS servers to attain high-accuracy readings Great circle routing on navigation displays and precise local WMM-95 geomagnetic declination calculations Precise map calibration algorithm (10 coefficient polynomial) allows even skewed, distorted, or non-orthorectified maps to calibrate accurately Better track and waypoint overlay support, printing support, and memory handling than GPSy and much more... please see our GPSy Pro screenshots page (warning: large image intensive) and GPSy Pro features page.