It can b done. Tried it on my wifi unit
Tether with my 3GS and can use the location service on google map.
Hook up on free wifi @ Starbucks also can use location service.
Even short drive can still pick up location on google map when tether with 3GS.
Find iPad function also no problem (for both wifi & tether)
Dow side is that it wil makan ur phone battery.

Have yet to try d Papago app nod iPad tether with phone....