Accurate location
From GeoWiki
Recording an accurate location for your Hidden cache:
There are several methods used by Geocachers to record the location of thier newly hidden geocache. your method may be different,and it is personal prefernce,based on your equipment as to what method you use.
1. leave the gps on GZ for a few minutes then take a wayppoint.
2. Take several waypoints at GZ, over a period of time. then manualy average the waypoints.
3. Take a waypoint at GZ, walk away 15m or so then return to GZ and take another waypoint. repeat this process in several
diffrent directions wherever possible.
( please add other methods)