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yes, there are cigarette lighter power adapters for at least some models of the Garmin Streetpilot. they are available on amazon.com and other online retailers.
YES! The system on the bike is 12v. The nuvi external power cord for cars is 12v
You can . But it will be out of charge when the battery charge in finished .So either you have to plug it somewhere and charge or else you will need a car charger so that it is never out of charge . in my opinion having a car charger is much more convenient as you do not have to worry about charging it .
Throw the Jaguar out as they have notoriously awful electrical systems.
Garmin Mapping Software is available with or without a GPS sensor depending on your laptop configuration. Try Garmin Mobile PC.
The garmin gecko gps has something other systems don't have, which is it is lighter and smaller than other gps systems. Also the garmin gecko gps tells you where you have previously traveled so you do not get lost. https://buy.garmin.com/shop/shop.do?pID=220
Yes, the Garmin Zumo does require batteries. It comes with a removable, rechargeable lithium-ion battery. It also comes with the cord necessary to charge the battery.
It sounds like it is time to have the internal battery replaced. This can be done by Garmin, or if you are handy, check the web for instructions on how to open the unit and replace the battery. If the unit is still under warranty, Garmin may not charge you for the replacement.
The only accessories you need for a Garmin is a computer to register it, and a car charger to charge the GPS in the car while in use. Other than that there is nothing you need.
For a Garmin Etrex GPS system, a receiver is not required. You can simply just buy a Garmin Etrex GPS and use it without having to buy any other accessories such as the receiver.
I'm cussing 3 to 5 hours...
Garmin eTrex is a line of GPS's put out by Garmin.