The default firmware version of the HERE + modules is ublox-1.10 firmware. The new version of 1.30 firmware includes new feature of fusing other satellite systems (Glonass / Beidou) with GPS for RTK operations, effectively increasing the RTK positioning accuracy. Therefore, it is recommended that all users upgrade to 1.30 firmware before using HERE+. During the preparation of this guide, ublox-1.40 version of the firmware has also been released. 1.40 version firmware introduced a new feature called the mobile base station, that is, the base station need not be fixed in a location. For example, a base station may be placed on a moving vehicle or boat. Upgrading to Ublox-1.40 version is similar to upgrading to 1.30. For users who do not need to use the mobile baseline feature, upgrading to version 1.30 is sufficient.