I have a used Garmin GPS 128 for sale. This is an older GPS unit but it should get the job done. I believe this is a basic unit that tracks and marks waypoints but doesn't include onboard maps (like a navigation system)
I have the unit, a cover, Marine GPS antenna, power cord, and a Johnny Ray quick release swivel mount.
I don't have the manual but you can download it for free at www.garmin.com
Garmin also has free software updates for the unit on ther website, all you need is a PC cable that you can purchase easily online...there were several on ebay when I looked.
My digital camera is dead so I can get pics, but it will be a few days. If you go to www.garmin.com
and look at 'discontinued items' you can get info on the unit.
That URL will get you right to the GPS 128 website with links to software updates and the manual.
I am asking $120 for the lot but may take reasonable offers.
The unit is located in Fort Collins and I can ship UPS.