GPS Garmin GPSMAP 78S The GPSMAP 78S adds a whole new dimension to the mariner-friendly 76-series navigators: a high-sensitivity GPS receiver, barometric altimeter and electronic compass, microSDâ ....
DT-202C is a digital theodolite which practical to use on the field. It has long duration of use, about 40 to 80 hours and has high accuracy of measuring about 2" . * Continous operating time of 4....