Do you have the latitude (pun intended) to use the format DD.DDDDDDDDD?
That is to say, express the location in terms of degrees only, with
decimal points to define accuracy instead of minutes and seconds? This
would preclude the need for data validation, altho it may entail some
conversion. It's been my preference to use decimal fractions of
degrees instead of minutes/seconds, since high degree of accuracy would
require decimal fractions of seconds.