Nautical calculator pro performs calculations and produces graphs of various problems of navigation. the main features are : - calculate route (solves 2nd navigation problem) - calculate point on rhumb line (solves 1st navigation problem). Nautical calculator 6.2.apk named id com.gabrielegi.nauticalcalculation can find in gabrielegi,nauticalcalculation,tools,nautical,calculator size for download 3232470 support sdk 14 android version 4.0.x.. Input all the above, then nautical calculator pro computes altitude and azimuth for the assumed position and time of the observation, 5. and compares computed and observed altitudes. 6. and plots the lines of position up to four stars, having calculated how much space they are moved ahead tacking into account the ship’s speed..