Tyler of coobrolabs writes about his latest open source project,
The Coobro Geo is an Arduino compatible through-hole GPS kit that allows you to navigate using only LEDs for direction and distance. It is built around the awesome Fastrax UP501 GPS module (MediaTek MM3318 chip). It is completely open source, so all design files and software are out there for you to modify and hack.
Coobrolabs lists the kit for $75.00. They also have the source files and instructions available for DIY builds and mods.
Via the contact form.
Only original LED navigation. Cost very expensive.Better use graphic display (cost = 15-16 LEDs). But interesting as device for children DIY