Hi all, sorry if this has been asked previously - I have had a quick look but could not find anything close. I have purchased CoordTrans as (hopefully) the Holy Grail to something I have been struggling with for over 20 years, finding cave entrances in the French Alps.
I have the Lambert coords but using CoordTrans does not appear to give accurate translations for GPS. Using Grotte de la Luire (a show cave) as an example, the published coords are 844.4 x 3292.53, using Memory Map, the GPS (WGS84) coords are 31N 691973 x 4973756. Using CoordTrans 844.4 x 3292.53 (NTF France III - as that places it in roughly the correct place on the little map - nothing else does!) this gives a translation of 691425 x 4975507. What an I doing wrong?
Many thanks for any help.