Bluetooth module GND connections

I am working with a bluetooth module for a project. I was wondering about the multiple GND pins on the module. Do they ALL need to be connected to ground or is is sufficient to connect only one of them to GND? For reference the module I am using is this one: https://www.sparkfun.com/products/10823

You are working with RF so, YES you need to connect all GND to the groundplane / RF shield

Pelle