There are various ways to join GSF.
Student: 20 euros
Active member: 50 euros
Benefactor member: 100 euros
Just keep in mind that GSF is a non-profit organization; your contribution is therefore supporting various things like this website to be alive, interns to travel abroad, trainings of future land professionals, etc...
Membership by check
Fill up this document and send it together with your check to GSF postal address:
Géomètres Sans Frontières
40, avenue HOCHE