![Configuring the Communication Settings in the Garmin GPSMap 421S and GPSMap 521S with GPS City - YouTube Configuring the Communication Settings in the Garmin GPSMap 421S and GPSMap 521S with GPS City - YouTube](https://i.ytimg.com/vi/4K2WVCvhtEQ/hq720.jpg?sqp=-oaymwEhCK4FEIIDSFryq4qpAxMIARUAAAAAGAElAADIQj0AgKJD&rs=AOn4CLDgVAlyAl8WABuNfzitR8jayMrFjw)
Configuring the Communication Settings in the Garmin GPSMap 421S and GPSMap 521S with GPS City - YouTube
![Garmin GPSMAP 521s GPS Chartplotter Sonar Fishfinder Display W/ Cover US Charts for sale online | eBay Garmin GPSMAP 521s GPS Chartplotter Sonar Fishfinder Display W/ Cover US Charts for sale online | eBay](https://i.ebayimg.com/images/g/6IsAAOSwtNZkrt6A/s-l400.jpg)
Garmin GPSMAP 521s GPS Chartplotter Sonar Fishfinder Display W/ Cover US Charts for sale online | eBay
![Garmin GPSMAP 521S GPS chartplotter with 5" display and satellite-enhanced worldwide basemap at Crutchfield Garmin GPSMAP 521S GPS chartplotter with 5" display and satellite-enhanced worldwide basemap at Crutchfield](https://images.crutchfieldonline.com/ImageHandler/trim/750/457/products/2013/34/150/g150521S-o_side.jpg)
Garmin GPSMAP 521S GPS chartplotter with 5" display and satellite-enhanced worldwide basemap at Crutchfield
![Garmin GPSMAP 521s GPS Chartplotter Sonar Fishfinder Display W/ Cover US Charts for sale online | eBay Garmin GPSMAP 521s GPS Chartplotter Sonar Fishfinder Display W/ Cover US Charts for sale online | eBay](https://i.ebayimg.com/images/g/ViwAAOSwVppkV21Y/s-l640.jpg)
Garmin GPSMAP 521s GPS Chartplotter Sonar Fishfinder Display W/ Cover US Charts for sale online | eBay
![Garmin GPSMap 521s Display + Bracket & Power Cable - Tested Working Updated - Max Marine Electronics Garmin GPSMap 521s Display + Bracket & Power Cable - Tested Working Updated - Max Marine Electronics](https://media.maxmarineelectronics.com/maxmarine/wp-content/uploads/2023/01/22132435/521s-Ivan-1202023-1-scaled.jpg)