50 ohm pcb strip vs 50 ohm connector for a GSM antenna

hello, I am working with a Itrax02/08 gps module. In the datasheet it states that you have to add a 50 ohm pcb trace for the antenna connection. However i am planing to use a antenna connector that already has a 50 ohm resistance. the question is, Do i still need to make the 50 ohm trace on my pcb, or is the resistance in the connecter sufficient?
if somebody could shine a little light on why there is a need to 50 ohm resistance, and the inportence of it, that would be appriciated

Connecter
http://www1.elfa.se/data1/wwwroot/assets/datasheets/u_fl_eng_tds.pdf

GPS module:
http://www.alldatasheet.com/datasheet-pdf/pdf/194446/ETC2/ITRAX02.html

It's not 50Ω resistance. It's a characteristic impedance of 50Ω. That should be correct the whole way from the antenna to the receiver, mainly because the antenna and the receiver were designed to work like that.

The advantage of having a known characteristic impedance is that each cable, connector or PCB trace only has to have the right characteristic impedance, and everything should work. Cable lengths don't affect the impedance, so they don't need to worried about too much.

https://en.wikipedia.org/wiki/Characteristic_impedance