GPS trolling motor conversion kit

[1sciguy]

Been looking at boat trolling motors lately for my small skiff.  Apparently the latest thing on the market is a GPS "anchor" or "spot lock" where the motor steers itself and changes thrust to lock itself in position.  They cost upwards of $2000-$3500, yet old manual trolling motors can be purchased for under $100.  There is definitely a market for a young engineer to make an upgrade kit for DIY people.  Not sure of the patent implications, but this is essentially drone technology.  I would imagine a GPS chip, microcontroller, and PWM speed controller can be under $100.  Rotation of the unit is the hardest part when you want it to be saltwater corrosion resistant.  Anyway, thought I would throw the idea out there if anyone wants to explore it.  I would do it myself if I weren't so busy with other projects.