Thanks Scottin, Ok. I see what you mean regarding battery drain with wi-fi on all the time. Too bad. I recently downloaded all my google location history and am updating thousands of photos from that using the LR plugin. That's a relatively slow process as for each batch one has to wait while the history file is analyzed and that only gives a location you were at 'around' the time the photo was taken. You can set the UTC in program to match the time at the location ...and then process all the images in that time zone.
Going forward I'll just take a smartphone photo at each location and sync all the others shot there to that.
Thanks for your advice!