With all the features available, it may be a bit confusing about what you may actually need in a GPS unit. In general, your GPS should be easy to use, durable and able to handle changing weather conditions. The model should have a vibration isolated motorcycle GPS mount that will keep it stable and functional at all times regardless of road conditions or velocity. For viewing purposes, it should be sun resistant and have anti-glare screens for easy viewing.
Consider the battery life span.Nothing is more irritating than riding your motorcycle and having your GPS not function properly when you really need it. Buy one with integrated rechargeable batteries so you will not have to worry about having to replace them when you are on the road. Models with this feature can use the battery power of your motorcycle to charge the GPS battery.
If you like to travel through heavily forested areas, purchase one that has a SiRF Star III chip set installed. This high performance feature is energy efficient and can help you accurately navigate through this type of terrain.