A portable surveying instrument consisting essentially of a drawing board and a ruler mounted on a tripod and used to sight and map topographical details.
一种便携式观测仪器，主要包括安放在三脚架上的绘图板和一把直尺，用于观测和绘制地形详图。
2
After discussing a series of problems that tourists faced, a personal tourism assistant designed with a portable computer, a GPS board, a GPRS transceiver and electronic map technology was introduced.