I have two Garmin Global Positioning System (GPS) units. Both are made by Garmin. The one on the left is a GPS III. It is a handheld, battery-power unit. It has a moving map display and you can load in waypoints and make and store routes using the waypoints. It will tell you when you approach a waypopint and tell you the distance to go to the next waypoinnt. There is no aural annunciation to alert you when you are approaching a waypoint. I used this for many years and it was helpful for finding me the way to unfamiliar places. However, I had to have a map to route the trip. The map included in the unit contains only major roads, but those roads were usually good enough to get you close. I have the carrying case and computer/external power adapter, and original box for that unit.
The unit on the right is a Street Pilot C320. It has detailed color maps of the US loaded on a 1 gigabyte SD memory card inserted into the side of the unit. It has a color touchscreen display where you program in your destination address (state, city, street address). THen it will determine the best route (shortest time or shortest distance) and a female voice will guide you there. It also has numerous places of interest in the area that you can select. These places of interest include airports (very useful when traveling), restaurants, shopping, etc. The unit has an internal rechargeable battery and a cigarette lighter plug/cable. I have the suction cup mount, cable, and original box for this unit.