I had a dream of chart plotter to my sailboat. I believe that a PC-system is a bad solution.Just consider how to keep it on the deck. So I tried to make it myself. Few days of thinking and then I took an old scanner apart. Then I made a microcontroller with 80c31 with LCD-display, flash, ram, eeprom, parallel I/O with powerdrivers and serial interface(RS232). Then I modied the scanner so that it has an y-direction movement as well. X-direction of course already exist. And a bright red led on it, there it is. Look at the picture where it is shown without the case. Now it is a ready chart plotter and it is working. Here it is shown with a city map from the phone book. And the position of the boat appears like this on the chart. I wrote the program in C and it was quite interesting job to me as a hobbyist.