APRSdos doesn't use the standard DD-MM-SS format directy. It uses a DDMM.MM format which is directly convertable from the DD-MM-SS by a simple dividing of the Seconds[SS] by 60. APRS only makes use of DEGREES and MINUTES in tact, and the SECONDS are only used in a decimal format. If you had an latitude of 42-38-55 and wanted to use this for APRSdos, then you would first write down the 42 and 38 together (like this: 4238). Then take the SECONDS (55) and divide it by 60 to obtain the decimal part of a minute (55 / 60 = .92 rounded to two places). Add this .92 to the 4238 you had written down, and you should have 4238.92 on your paper. Save this value for your latitude and use it to answer your location question in APRS. You will do the same thing for the Longitude. APRS windows version takes the values in DD-MM-SS.