So just to recap, the mail tag returns the lat,lng.
The forms submits a $_POST['lat-<map-field-name'] and a $_POST['lng-<map-field-name'] which you can access by hooking the cf7 action hook wpcf7_mail_sent as well as wpcf7_mail_failed just in case the mail failed but the form still submitted successfully.
@jdembowski my point is that I want to re-title threads so make it easier for users to find the information/solution. @otto42suggested I try to ask moderators to do this, but I am not sure how to go about it.