GPS neo 6m problem - no fix - Networking, Protocols, and Devices - Arduino Forum
no matching function for call to 'SoftwareSerial::SoftwareSerial(const uint8_t&, const uint8_t&)' in ver 2.6.0 · Issue #6737 · esp8266/Arduino · GitHub
Software Serial Conflict between GSM and GPS · Issue #28 · mainehackerclub/open_vehicle_tracker · GitHub
Car GPS tracker with thinger.io map integration - Hackster.io
SoftwareSerial is unstable in 2.4.0 · Issue #63 · plerup/espsoftwareserial · GitHub