She gives you a call point.  If you no show or call the coppers...  you still do not know her exact location.  In the old days, a gal would be able to observe the call point & it still happens sometimes.  You can not assume she will not observe.  

On one occasion, I had a date with a gal I'd seen several times...  but in a different location.  I arrived early, confirmed the location but withdrew to wait at the corner coffee shop.  (Sitting in a hotel lot IS conspicuous!)  So I called her as I turned into the lot & she (apparently glancing from her window) replied "I don't see you!"  I told her I was pilling up...  but she WAS observing.   I'd say about 50% of my first meetings, I was observed prior to entry.
A young MILF gave me an address.  I went to that location & that number didn't exist...  She came up behind me from across the street.
I call at the call point & the gal stayed on the phone with me through a series of turns.  I ended up at the same place, on the other side of the street, in front of her door...  and she was sure I wasn't followed.
A stunning lady had me call from a major intersection...  gave me directions, a couple of blocks down & up a side street.  She told me when to stop.  She clearly observed me arrive.
A lady gave me directions, watched me arrive from her window & directed me to her stairs.  

I do not mind.  It's a small step at security.  It's how the game is played.