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GED recognizes pretty much anything you put into it, even MGRS (what the military uses, Military Grid Reference System).
Yeah, if you flip the two elements of the lat/long, that’s like flipping a phone number backwards.
I think where you’re going wrong is not delineating *which* 89 degree longitudinal line you’re referring to when asking GED (or any mapping program) where it is.
Because there’s more than one, since the Earth is round. I can text it out here, but a good way to wrap your head around this (if you’re like me anyway) is to just SEE it in person. So I recommend booting up GED, going to the menu, click on View, then click on Grid and you’ll get all the lines like you see in the screenshot below.
So the reason you’re going to Tibet or Timbuktu or wherever when you punch in the coordinates given by SeaTow is because you’re not telling GED if that 89 degree line is east or west of the Prime Meridian (the line going north to south).
Using a longitudinal coordinate that’s devoid of E or W (or a minus) is assumed to be east. If you put a minus in front of 89 you’d fly to the correct position.
Also, once you understand this relationship of lat/long, you can tell where coordinates are in Louisiana without seeing them on a map. Maybe not an exact position, but you’ll know if they were in the Lake P Basin, Grand Isle, etc.
The “crosshairs” of 30/90 is a trash heap off the ICW by Boh Bros in New Orleans East. So anything NE of that will be 30/89, SE of there 29/89, NW of there 30/90 and SW 29/90.
That encompasses most anywhere you would fish.
