aprs_tool/users.csv

1	userId	name	city	locations
2	a1b	Joe	Paris	['0001', '0002', '0008']
3	a2c	Jenny	London	['0003', '0004']
4	b1b	Jack	London	['0003', '0005']
5	b2c	Jill	Berlin	['0006', '0007']