MG229 is a free tool for celestial navigation. It performs calculations similar to those tabulated in the 6 volumes of H.O. 229
Using MG229
Enter dead reckoning position, without rounding, for DR.
Enter celestial body's GHA (Greenwich Hour Angle) and declination (you must obtain these values from the Nautical Almanac).
If "Round AP" is checked, AP (assumed position) is rounded to nearest whole degree of latitude, and to a longitude chosen to give a whole degree LHA. Otherwise AP is simply DR.
Body's LHA (local hour angle) is computed automatically from GHA and DR longitude if "Calc from GHA" is checked.
To match the tabulated entries in HO 229, check "Round AP", uncheck "Calc from GHA", and enter LHA manually instead of GHA.
Hc and Ho are the predicted (Hc) and observed (Ho) altitudes of the celestial body.
"Contrary" means that Declination and Latitude are in opposite hemispheres; "Same" means they are in the same hemisphere.
To plot the LOP, begin at the AP. LOP is perpendicular to the Azim value, at the given distance from the AP.
Using the Angle Entry Screen
The "DDD", "DMM", and "DMS" pushbuttons select among decimal degrees, degrees and decimal minutes, or degrees/minutes/decimal seconds.
The "° ' ''" button cycles through the degrees, minutes, and seconds fields. You can also tap on a field to select it.
The "000" button truncates the current field to an integer, and zero-fills the fields to the right of the current field.
Use the S/N, E/W, or +/- pushbuttons to change the sign of your angle.
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Supported operating systems:
Palm OS 3.x, Palm OS 4.x, Palm OS 5.x
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