The original GPS receivers in the late 80s and early 90s did not have maps. And they used LCD screens. The one I owned by Lowrance required 6 AA batteries. Not AAA. Not rechargeable. Optional power through a cigarette-auto cable, but that's not helpful when on foot. It burned through batteries like crazy. I owned this one: https://web.archive.org/web/20231104153749/http://retro-gps.... (Lowrance GlobalNav Sport) 160…
Thanks for sharing this, I never had the chance to see one of these units. It's so weird now to imagine GPS with no map!
P.s. What does a six-channel GPS receiver even mean? Is more channels more better?