Connect the phone to wifi. Find the location. Activate the directions. Plug the phone into the cigarette lighter outlet. You won't be able to add more locations--unless you go to somewhere with free wifi.
A prepaid track phone from Walmart would also work.
No way am I going to buy a gps for $300--not unless it can do dishes.
Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.