How to read a NMEA gps data and prase mannually ?

Hello

I am not sure what you mean when you say "can't store data the everytime the GPS module send the data."

Can't you just declare a global variable

String nmeaSentence

and then, in the loop(),

while (Serial.available())

nmeaSentence.concat(Serial.Read());

When you receive a CR or LF (0x13 or 0x10) the sentence is complete and you can parse

I'm not quite sure what the question is.

There are many explanations of the NMEA format out there such as:

https://www.trimble.com/OEM_ReceiverHelp/V4.44/en/NMEA-0183messages_MessageOverview.html

https://www.sparkfun.com/datasheets/GPS/NMEA%20Reference%20Manual-Rev2.1-Dec07.pdf

https://www.gpsworld.com/what-exactly-is-gps-nmea-data/#:~:text=Today%20in%20the%20world%20of,and%20match%20hardware%20a…

There is a lot of source code showing how to parse it such as:

https://github.com/Glinnes/NMEAParser

https://github.com/Knio/pynmea2

Are you asking how to store data after it is parsed?

Where do you want to store the data?

What do you want to do with the data?