Just stick the grove connector to the GPS w/ grove connector into the right grove connector on the BBG (beaglebone green). UART2!

config-pin p9.21 uart && config-pin p9.22 uart

That command will give you the access to UART2!

...

Then...

Hello,

Please forgive me. For some reason the Python and Python3 exchange has not worked to my liking. I am going to go back to regular Python if you still run Buster and not Bullseye.

...

import serial
import Adafruit_BBIO.UART as UART
from time import sleep

UART.setup("UART2")
ser=serial.Serial("/dev/ttyS2", 9600)

class GPS:

    def __init__(self):
        # This sets up variables for useful commands.
        # This set is used to set the rate the GPS reports
        UPDATE_10_sec =  "$PMTK220,10000*2F\r\n" # Update Every 10 Seconds
        UPDATE_5_sec =  "$PMTK220,5000*1B\r\n"   # Update Every 5 Seconds  
        UPDATE_1_sec =  "$PMTK220,1000*1F\r\n"   # Update Every One Second
        UPDATE_200_msec =  "$PMTK220,200*2C\r\n" # Update Every 200 Milliseconds
        # This set is used to set the rate the GPS takes measurements
        MEAS_10_sec = "$PMTK300,10000,0,0,0,0*2C\r\n" # Measure every 10 seconds        
        MEAS_5_sec = "$PMTK300,5000,0,0,0,0*18\r\n"   # Measure every 5 seconds
        MEAS_1_sec = "$PMTK300,1000,0,0,0,0*1C\r\n"   # Measure once a second
        MEAS_200_msec = "$PMTK300,200,0,0,0,0*2F\r\n"  # Meaure 5 times a seconds
        # Set the Baud Rate of GPS
        # BAUD_57600 = (b"$PMTK251,57600*2C\r\n")          # Set Baud Rate at 57600
        BAUD_9600 = "$PMTK251,9600*17\r\n"             # Set 9600 Baud Rate
        #Commands for which NMEA Sentences are sent
        ser.write(BAUD_9600)
        sleep(1)
        ser.baudrate = 9600
        GPRMC_ONLY = "$PMTK314,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*29\r\n" # Send only the GPRMC Sentence
        GPRMC_GPGGA = "$PMTK314,0,1,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*28\r\n" # Send GPRMC AND GPGGA Sentences
        SEND_ALL = "$PMTK314,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0*28\r\n" # Send All Sentences
        SEND_NOTHING = "$PMTK314,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*28\r\n" # Send Nothing
        ser.write(UPDATE_1_sec)
        sleep(1)
        ser.write(MEAS_1_sec)
        sleep(1)
        ser.write(GPRMC_GPGGA)
        sleep(1)
        ser.flushInput()
        ser.flushInput()

    def read(self):
        ser.flushInput()
        ser.flushInput()
        while ser.inWaiting() == 0:
            pass
        self.NMEA1=ser.readline()
        while ser.inWaiting() == 0:
            pass
        self.NMEA2 = ser.readline()
        NMEA1_array = self.NMEA1.split(',')
        NMEA2_array = self.NMEA2.split(',')
        if NMEA1_array[0]=='$GPRMC':
            self.timeUTC = NMEA1_array[1][:-8] + ':' + NMEA1_array[1][-8:-6] + ':' + NMEA1_array[1][-6:-4]
            self.latDeg = NMEA1_array[3][:-7]
            self.latMin = NMEA1_array[3][-7:]
            self.latHem = NMEA1_array[4]
            self.lonDeg = NMEA1_array[5][:-7]
            self.lonMin = NMEA1_array[5][-7:]
            self.lonHem = NMEA1_array[6]
            self.knots = NMEA1_array[7]
        if NMEA1_array[0] == '$GPGGA':
            self.fix = NMEA1_array[6]
            self.altitude = NMEA1_array[9]
            self.sats = NMEA1_array[7]
        if NMEA2_array[0] == '$GPRMC':
            self.timeUTC = NMEA2_array[1][:-8] + ':' + NMEA1_array[1][-8:-6] + ':' + NMEA1_array[1][-6:-4]
            self.latDeg = NMEA2_array[3][:-7]
            self.latMin = NMEA2_array[3][-7:]
            self.latHem = NMEA2_array[4]
            self.lonDeg = NMEA2_array[5][:-7]
            self.lonMin = NMEA2_array[5][-7:]
            self.lonHem = NMEA2_array[6]
            self.knots = NMEA2_array[7]

        if NMEA2_array[0] == '$GPGGA':
            self.fix = NMEA2_array[6]
            self.altitude = NMEA2_array[9]
            self.sats = NMEA2_array[7]

myGPS=GPS()
GPSdata=open('/GPS_data/GPS.txt', 'w') # write the file but first make sure it is located in the GPS_data dir.
GPSdata.close()
while(1):
    myGPS.read()
    if myGPS.fix != 0:
        try:
            latDec = float(myGPS.latDeg) + float(myGPS.latMin)/60.
            lonDec = float(myGPS.lonDeg) + float(myGPS.lonMin)/60.
            if myGPS.lonHem == 'W':
                lonDec = (-1)*lonDec
            if myGPS.latHem == 'S':
                latDec = (-1)*latDec
            alt = myGPS.altitude
            GPSdata = open('/GPS_data/GPS.txt', 'a') # append the writen file GPS.txt in the GPS_data directory...
            myString = str(lonDec) + ',' + str(latDec) + ',' + alt + ' '
            GPSdata.write(myString)
            GPSdata.close()
        except:
            pass

This is the update to Python3 but for some reason, it is not running right now. I will get closer to the window or go outside to run the GPS module to keep testing. Sorry for the conclusive evidence. It seems that on Python3, there are many changes that affect the output of bytes and strings.