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Enabling GPS on RPI 4 (GlobalSat BU 353S4)
Wanted to share my path for those who might also have struggled a bit to get the GPS puck (Global Sat BU 35324 ) running on the PI 4

(as best I understand it)
1) BU-353 is set to binary mode by default 
2) Linux GPSD prefers NMEA 0183

[Elsewhere there are instructions for installing a RAR package on Raspian for building the Global Sat proprietary driver, but this ended in a dead end for me]


1) Identify where the device is being assigned

Find the name / company (eg. Prolific ..)


$ Bus 001 Device 011: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port

Then determine the where it's assigned


. . . . 
[ 3616.831274] usb 1-1.3: Manufacturer: Prolific Technology Inc. 

In terminal, change it from binary to NMEA mode (*note, I determined mine was assigned to USB1. 

You might find yours is USB0 etc., modify as required)

$ gpsctl -f -n -s 4800 /dev/ttyUSB1

$ /dev/ttyUSB1 identified as a SiRF 9GSD4e_4.1.2-P1_RPATCH.05-F-GPS-4R-1510281 11/03/2015 307 at 4800 baud.
gpsctl:SHOUT: switching to mode NMEA.

3) Using Open Plotter "serial" menu
assign alias to appropriate device 
/dev/ttyOP_ gps

set data type to NMEA 0183 

"Apply" changes

4 Assign
Open the connections tab, select "ADD to GPSD"

5 Check
in terminal run
cgps -s

6 OpenCPN
Setup: Options / connections
Add connection, Network
Select GPSD

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Enabling GPS on RPI 4 (GlobalSat BU 353S4) - by kwsherwood - 2020-01-07, 08:49 AM

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