I have an Arduino GSM Shield mounted on an Arduino Uno. Can I stack this GPS shield above Arduino GSM shield? Will there be any pin configuration problem?

In GSM Shield hardware pin’s configuraton are as below:

0 - Not connected
1 - Not connected
2 - GSM Rx
3 - GSM Tx
7 - Modem reset

If there is any problem, how can it be solved? I would be happy if there are any alternatives for the GPS shield.