What is good about the graphical method with Messkarte, you actually measure two stars almost simultaneously, then read from the Messkarte LHA of the second star, subtract the SHA of this star from it and add to the obtained SHA Polaris value to get the LHA Polaris and determine your latitude using the correction table to the altitude Polaris. Longitude can be determined to the nearest degree by subtracting SHA from LHA (read from Messkarte), and then subtracting GHA Aries at the time the stars were measured from the obtained value.
