session sessions variables location geocoding php blocks

I need two snippets of code. I unfortunately can only pay a total bounty of $100, since the site in question does not generate any income at this point.

Can anyone help me on these?

1) When a new session is started (authenticated or anonymous user) save into session data:

country
postal code
    I currently have this data available in variables, so they are accessible using get_variable i believe

lat
lng
    this can be determined with the above using some function in the location/gmap suite