ArcGIS Survey Analyst extension supports .gsi import
Survey Analyst imports and exports measurements and other field data from Total Positioning System (TPS) equipment using the following survey data converter formats: ASCII converter, Geodimeter converter, GSI converter, SDR converter, TDS coordinate converter, and TDS raw converter.
The data import utility can be extended programmatically to import additional data formats.
http://www.esri.com/software/arcgis/extensions/surveyanalyst/common-questions.html
Which data formats can be imported into a survey project?
You can also convert points to polygons (min of 3 points) programmatically for automating land parcel creation.