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Originally Posted by berdan
lksteve
could you explain making own lat/long rules. Do you make one for each scale?
60 tic marks, and each tic would be diff min. and sec. for each scale?
regards
berdan
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1st draw the lat/lon lines on the map(s) you're using. Then select a straight edge that is longer than the distance between the latitude lines. Mark it with the 60 divisions. The scale that you constructed should be so long that it lays across the map at an angle. Lay it on the map with the extreme points touching the lat (or lon) lines. As the scale of the map changes, the angle of the improvised scale will also change. The only thing you care about is an equal division of the area which you will get this way - sort of like a parrallel ruler. Slide the scale L/R or U/D until one of the 60 tick marks touches the desired point. Count and interpolate for min/sec. Move to the other lat/lon reference line and repeat for the second half of the coordinate. Hope this helps.
Edited to add - What lksteve said! It always takes me too long to type.