APRS: Automatic Packet/Position Reporting System
Some Ham Operators choose to "beacon" their current location, from their vehicle, bicycle, or even their backpack or purse, using the APRS System.
[A Gentle Introduction to APRS (by N6NBN, 2013)]
In North America, the most commonly-used frequency is 144.390 MHz Simplex.
There are many "works out of the box" solutions, including Byonics.com; I use 2 of their "MT-AIO" units, which can be carried easily in a back-pack, or installed in a vehicle; they will run off of 8 AA batteries, or from external 12-volts DC.
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But, you ask: How can I "see" where these Hams are at the moment?
This site works really well: APRS.fi