GPS and Inspection Basics GPS Basics n GPS

GPS and Inspection Basics

GPS Basics n GPS = Global Positioning System n Requires minimum of 4 satellites’ signals. n PDOP < 8 (dilution of precision) n “R” for radio signal Realtime correction (or little tower symbol) n Trimble GPS unit with data collector (TDC 1, TSC 1, TDCe) or Trimble Geo. XT, Geo. XH, etc)

Satellite Signals n Number of satellites n Location of satellites. n Trees and buildings block satellites. n Satellites low on horizon not used. n High PDOP = poor configuration. n “Quick Plan”, in Pathfinder Office, to see satellite availability.

Quick Plan: Satellites vs PDOP

Trimble Pro. XR Antenna n Receiver n Batteries n Data collector n

GPS Settings

Inspection Procedure n Create Data File: n Name it – MN 23 MP 22. ssf n Choose Data Dictionary – New. Feat. V 5. ddf

Data Dictionary is Important! n Use New. Feat data dictionary for features new to Hyd. Infra n Use Exist. Feat data dictionary for features previously inventoried. Must have Hyd. Infra ID n Must have correct Hyd. Infra ID n

Begin Inspection at Feature n Create New Records: n Basic Session (always first) n T_Sp. Strucand. Insp n T_Pipeand. Insp n T_Strucand. Insp

Data Collector n Use arrow keys to choose menu items n Arrow down to next feature n Choose a letter to move to menu choice n Fill in all required fields n Hit Enter to save the record n Esc to not save the record

Most Common Mistakes n No GPS location recorded Watch for message that no positions were recorded n If no location is recorded, the data will be lost n

Pipe Inspection Report