Yes but even if you have it all set up and working correctly it still won't pick up anything if the database doesn't contain the correct frequencies for the areas that you are traveling through. I find up here around Grande Prairie, Alta there are so many incorrect or missing frequencies/users and submitting them takes so long to get them in right and in the right areas.
If you're using your HP-1 with a GPS, then you wouldn't have a problem using either the 536, or 436, with one. The main difference would be that the 536/436 would also work on the P25 Phase 2 systems that the HP-1 does not load.
I haven't taken a trip yet with my 436, but next time I do, I'll use the GPS on it instead of taking the HP-1.