How do I know what address and the length of MTK gps log to read?

How do I know what address and the length of MTK gps log to read?

I have a MTK chipset GPS Log. In order to read the logged data from it , I
need to send NMEA command:
$PMTK182,7,ADDR,LEN*<CheckSum><CR><LF>
ADDR: Start address of the log data
LEN : The length of the log data
I tried researching how do I know the address from which to start read the
data and the length of the required data and couldn't find an answer.
Help will be appreciated.