liudr:
Can you change the speed of your gps to something less fast, say 28800 or 14400? Arduino runs 16MHz crystal frequency so its 38400 is not exact when it uses its clock to time software serial inputs so lowering speed may help. If you're off by 10% then you get a wrong byte thus some special character.
Thanx liudr,
But I am using a non-branded GPS which doesn't even have an RX, only TX (3 wires, +, - and TX) so apparently there is no way I can write back to GPS.
I have another GPS module which is 5V, shall I switch to Pro mini 5V instead? I will still be needing at least 1 software serial as I need to connect a GPS and a GSM modem.
Thanx!