读取GPS的观测O文件，读取速度较快，不占用过多内存-GPS observations O file reading, reading speed, do not take up too much memory

通常GPS定位信息接收系统主要由GPS接收天线、变频器、信号通道、微处理器、存储器以及电源等部分组成。由于GPS定位信息内容较少，因此多用RS-232串口将定位信息（NEMA0183语句）从GPS接收机传送到计算机中进行信息提取处理。-GPS location information is usually received by the GPS receiver system antenna, frequency converter, signal channel, microprocessor

Complete GPS Datalogger Project using PIC16F690. It uses a standard SD CARD in SPI mode as the memory to store the GPS data. Does not uses a FAT File System though.