Hello @Siya,
a. My issue is not with the GPS but with the Lidar giving 1m signal when its over its limit. This means that it measures ok and when its limit its exceeded it goes down to 1m and UAV instantly stays in place.
b. In this Thread How to make the TFMINI rangefinder talk I2C @ppoirier tested and with an arduino mod on I2C managed to give proper signal. My issue was that i was going for a serial connection and not I2C.
c. Can Benewake verify what is the signal output when the Sensor its over its limit?