Originally Posted by
volosong
Thank you all for your input. I have an Oregon, (one of the first versions available), and an eTrex 30. (In fact, I have about eight handheld GPS receivers because I used to teach "Map Interpretation and GPS" at my local community college.) I'll do some 'testing' with my 30, and if it does what I want, then I'll take a very close at the 35. Carrying a bag full of rechargable Enloops will take care of 'trashing the environment' issue.
Openstreetmaps is a very good resource. I have their data on most of my receivers, even the Edge 800. Openstreetmaps have 'saved my butt' more than once when wandering throughout Italy. Failing the above, then I'll go with the power packs that you guys recommended. In any case, there are options, and I thank you for making me aware of them.
Theres also the dynohub option which is how I keep my Edge 800 and iPhone charged whilst on tour.
Theres little worse than having to hang around a caravan park bathroom charging your electrical items.
Many of them here abouts close the kitchen/common room early evening so the bathroom and occasionally the laundry is your only option for power. You can't leave or your charging items will be pinched but its hardly where you want to hang out for a few hours.
My dyno system feels like chump change compared to the above inconvenience. It also charges my Petzl Tikka 2XP head torch.
Sony cameras like the RX100 and A6000 can also be charged via its usb format charging.