Precaution in GPS static observation

As discussion with my GPS consultant on the final result

Based on the GPS result and I did a comparison in distance with my total station. For every 1km, the propagation error is about 7cm by total station. The number of station in this traverse is 25 and each line contribute error of 7mm (short). The shortage of 7mm is correct when I compared with my EDM test on August 2009 and we noticed our instrument problem. Thus I can verify the distance by GPS is perfect calibrated. This is the main reason in the survey circular 2009 stated that traverse need to tie with CRM (Cadastral Reference Mark) or proven old mark for every 25 station or 1km(urban survey) or 2.5km (rural survey) which is early. In my case, my distance error contribute nearly 190mm for 2.5km.

While difference in bearing, I adopted GPS observation is correct since GPS is based on grid north while our cadastral sun observation is based on true north. I will do the sun observation to verify the GPS bearing when I in the field.

I have another 4 marks fail in processing and one of the reasons is due to no data connection from JUPEM during the observation. It causes the raw data of GPS observation can not apply the correction. This is one of disadvantage of using Static method. The best solution is using real time MyRTKnet.