Accuracy of Reach

2: i want to make use of the free correction date form hk website , any suggestions ?
Check what service they provide. VRS? Option to upload data to process or download stream or timespan and Rinex version

here is what they have provided, sorry i am newbee on this field .

GNSS RINEX Data Download Service

Network RTK Real Time Positioning Service

Differential GNSS Real Time Positioning Service