RS300x - Operating Instructions RS300X_RS300XG1_RS300XSD_um_en User Guide for Polar SmartWatch and Wearable, Free Instruction Manual · Polar Personal Computer RS300X user interface. G1 GPS SENSOR and S1 FOOT POD are available accessories for measuring speed and distance. Thanks for choosing Polar! Downloading to your computer - You can also download the user manual Polar Heart Rate Monitor RS300X to your computer and keep it in your files. However, if youFind and download user guides and product manuals. The Polar RS300X training computer displays and records your heart rate and other data during training. See the Polar G1 GPS Sensor user manual for. - Getting started guide - · 2. How to use the RS300X receiver · 3. Starting the RS300CX · 4. Starting the G1 GPS Sensor.