Handheld GPS high quality reasonable price Main features:20 channel, more accurate, more reliableindustrial high-definition color ... national standard, customizable user vector, contour mapTechnical datal Channel: 20 parallel channels (L1, C / A)l Positioning ... Material: Industrial grade materialsl Waterproof grade: IPX-7l Operating temperature: -20 °C - +60 °Cl Storage temperature: -30 °C - ...