Terry,
Thanks that was most helpful. In addition to the questions you had in regards to the "Lite" thing, and the dimming difference Can somebody explain the difference between Automatic Dimming and Multi-level?
I also noticed a significant difference in Number of Waypoints. 2820 has 2000 and Zumo 500. What are waypoints and how can that affect the ability of the unit?
In my investigation into these units I've also seen where you can get "shades" to put on them which I would assume this is to keep the glare off. Has anybody used one of these and would it help when sun was directly behind you.
I do appreciate all the replies. 
Ride Safe,
Fired00d
Gary...Having not had one in hand, I'm not 100% certain, but I would assume that the Multi-Level means it is manually adjusted for brightness of display. The Zumo may also have a "night time" mode like the 2820 with a black background...it switches itself to that mode automatically, which is waht I think they mean by autodimming. What this does for me on the 2820 is really make the roads "pop" from the background when you need them to most. I don't normally ride at night, but the couple of times I've been caught (riding to Tampa, got caught in a traffic jam, had to detour, and I would have been in a world of hurt without the GPS...rode 3 hours on unfamiliar roads in the cold and dark), this has really been a nice feature. The 2820 is rated to be equally waterproof to the Zumo, so that's out of the equation for you, Gary.
The glare covers for the units, while functional, look like a monkey's ass sewn up with a grapevine, IMO, so I don't think you're going to want one of those hanging off your scooter, if I know you at all.
Waypoints...here's a definition/explanation which may either clarify or make it more cloudy...
Waypoints and GPS
GPS systems are increasingly used to create and use waypoints in navigation of all kinds. A typical GPS receiver can locate a waypoint with an accuracy of three metres or better when used with land-based assisting technologies such as the Wide Area Augmentation System (WAAS). Waypoints can also be marked on a computer mapping program and uploaded to the GPS receiver, marked on the receiver's own internal map, or entered manually on the device as a pair of coordinates.
If the GPS receiver has track-logging capabilities, one can also define waypoints after the fact from where one has been. For example, marine GPS receivers often have a “man overboard” function, which instantly creates a waypoint in the receiver for the boat's position when enabled and then begins displaying the distance and course back to that position.
In GPS navigation, a “route” is usually defined as a series of one or more waypoints. To follow such a route, the GPS user navigates to the nearest waypoint, then to the next one in turn until the destination is reached. Most receivers have the ability to compute a great circle route towards a waypoint, enabling them to find the shortest route even over long distances, although waypoints are often so closely spaced that this isn't a factor.
Many GPS receivers, both military and civilian, now offer integrated cartographic databases (also known as base maps), allowing users to locate a point on a map and define it as a waypoint. Some GPS systems intended for automobile navigation can generate a suggested driving route between two waypoints, based on the cartographic database. As one drives along the route, the system indicates the driver's current location and gives advance notice of upcoming turns. The best of these systems can take into account traffic restrictions such as one-way streets and intersections where left or right turns are prohibited when computing the suggested driving route.
Most GPS receivers allow the user to assign a name to each waypoint. Many models also let the user select a symbol to identify the waypoint on a graphical map display from a built-in library of icons. These include standard map symbols for marine navigation aids such as buoys, marinas and anchorages, as well as such land-based symbols as churches, bridges, shopping centers, parks, and tunnels.
GPS receivers used in air or marine navigation may contain large databases of standard, named waypoints that can be used to coordinate navigation with other aircraft or ships in the area. Some receivers are integrated into autopilots or flight management systems that will pilot an aircraft or ship along a planned route without human intervention. The routing information for the flight plans used in modern aviation often consists of a list of the waypoints that the flight will follow. Most waypoints used by aviation GPS receivers correlate with waypoints established on charts and other navigational documentation.
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Topic: Garmin Zumo or 2820 ? (Read 10368 times)