[Longitude of start point] may have to manually enter
[Lattitude of start point] may have to manually enter

[latitude] use latitude from data set
[longitude] use from data set


ACOS( SIN([Longitude of start point]*PI()/180)*SIN([latitude]*PI()/180) + COS([Longitude of start point]*PI()/180)*COS([latitude]*PI()/180)*COS([longitude]*PI()/180-([Lattitude of start point])*PI()/180) ) * ((6371*2)/3) as [Distance]