Arduino Fishing-Downrigger and Reel

Hello, I am new in Arduino need some suggestions, I am trying to receive NMEA from the fish finder speed and depth,
and control a DC motor forward and reverse to reel.
I had managed to get the NMEA data from the NMEA simulator with some example codes.
but stuck on the parsing issue.

#include <SoftwareSerial.h>
#include <Wire.h> 
#include <NMEA0183.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);

// matches Zihatec RS422/RS485 shield
SoftwareSerial gps(2, 3);

NMEA0183 nmea;

void setup()
{
  // Start Serial
  while (!Serial);
  Serial.begin(4800);
  gps.begin(4800);
  Serial.println("NMEA0183 parser test");
   // Start LCD
   lcd.begin();
   lcd.backlight();
   
   
}

void loop()
// Reveive data from GPS
{
  if (gps.available())
  {
    char c = gps.read();
    if (nmea.update(c))

    {
      Serial.print("NMEA0183 sentence accepted (");
      Serial.print(nmea.getFields());
      Serial.print(" fields): ");
      Serial.write(nmea.getSentence());
      Serial.println();
// Display Data from GPS  
        lcd.clear();//Clean the screen      
        lcd.setCursor(0,0);
        lcd.print(nmea.getFields());
        lcd.setCursor(3,0);
        lcd.print(" data received ");
        lcd.setCursor(0,1);
        lcd.print(nmea.getSentence());
// Receive data from load cell - to understand the max load on the line 

// Receive data from AMPmeter - to understand the dc load

// Receive data from Rotation meter to calculate the revolutions of the reel

// Send and Receive commands from Bluetooth

    }
  }
}

I need some suggestions and help on parsing the following two sentences in the loop
From $SDDBS 3rd 12,4 meters depth
From $GPRMC 6th 6 knots of speed

Serial monitor output:

NMEA0183 sentence accepted (6 fields): $SDDBS,40.7,f,12.4,M,6.8,F*0B
NMEA0183 sentence accepted (12 fields): $GPRMC,120300.087,A,3456.14,S,13832.68,E,6.0,43.9,300920,*09

I don't think you have to parse it yourself - it looks like the library does it for you: there's a Field function that will give you the individual parts of a message.

thank you for the suggestion, I read the all the details for the library but I could not find any instructions.
also I could not find any example for parsing for the library NMEA0183.h, that is why I could not figure out.

I found a version of the library on github. There are examples there; the one I looked at shows use of Field.

Great , can you send me the link?

Example:

Thanks