> Using 16-bit floats for lat/lon gives you accuracy down to 1 meter. Not for Longitude it doesn't with values > abs(128), as that for example means 132.0 has

> Using 16-bit floats for lat/lon gives you accuracy down to 1 meter. Not for Longitude it doesn't with values > abs(128), as that for example means 132.0 has the next possible value of 132.125. float16 precision at values > 16 is pretty poor. Converting that discrepency (132.125 - 132.0) to KM gives 10 KM. Did you maybe mean Fixed-point? (but even then that's not enough precision for 1m)