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Here3 GPS Manual. Overview. The Here3 GPS is a high precision GNSS system, which also supports RTK navigation mode, built with CAN protocol.The Here2 RTK GPS receiver is a new RTK GPS module from HEX that provides highly reliable navigation. Using RTK, PX4 can get its position with HERE+ GNSS USER GUIDE 2) Basic Operating Manual . beidou) with GPS for RTK operations, effectively increasing the RTK positioning accuracy.