You can use script without any options, Defaults are 100km from given base location (53.3381985, -6.2592576) with file name with customers data 'customers.txt'
Optionally: '-l', 'Current location like (53.3381985, -6.2592576)' '-p', 'Current place like Dublin' '-d', 'Needed distance' '-f', 'Input file with customers list' '-t', 'Type of calc: vincenty(1) or great_circle(2)' Note: do not use -l and -p at te same time; if -p provided it will override -l option
E.g. python gbd.py -p "Moscow, Center" -d 50 -t 2 will result the list of customers in circle of 50 km from center of Moscow using great_circle calc approach.
See output in json format in res.json