Point One Smart Antenna with Android
SW Maps replaces ntrip-example with an Android app. It reads the antenna's position, pulls Point One corrections over the phone/tablet’s internet connection, and sends them back to the antenna.
Create a Free Point One account
You'll get a free six month extended trial of our highest accuracy service so you have plenty of time to get building. Sign up before starting the tutorials below.
Use the same email address you used to register for FUSE.
Connect the antenna
Install SW Maps from Google Play and open it.
Plug the antenna into the phone/tablet. When Android asks whether to let SW Maps access the USB device, tap OK.
Open the menu (top left) and choose GNSS Connection.
Set:
Connection mode: USB Serial
Instrument model: Generic NMEA
Baud rate: 115200
Enter your antenna height (recommended but not required), then tap Connect.
The status bar should start showing coordinates from the antenna rather than the device's own GPS.
Set up the NTRIP client
Open the menu, hit the plus sign, choose NTRIP Client, and enter:
Field
Value
Name
Whatever you want to name the device
Address
truertk.pointonenav.com
Port
2101
Mountpiont
AUTO
Username
NTRIP Username
Password
NTRIP Password
Send NMEA GGA
On
Verify status
Open the menu and choose GNSS Status.
Fix type goes from GPS or DGPS to RTK Float, then to RTK Fix
Horizontal accuracy drops to a few centimeters
On the map, the location marker turns green
A fix usually takes from a few seconds outdoors with a clear view of the sky.
Troubleshooting
Symptom
Fix
Connected, but no coordinates or garbled data
The baud rate doesn't match the antenna's. Use 115200
NTRIP error 401 / Unauthorized
Your username, password or mountpoint is wrong or your account is not active
NTRIP connects but no data arrives
Turn on Send NMEA GGA, and wait until the antenna has a GPS fix
Stuck in RTK Float
Move away from buildings and trees and check that the corrections are still arriving
Sample Smart Antenna output
Example GGA sentence
Key
Value
Field
Meaning
$GNGGA
Sentence ID
GPS/GNSS fix data
212418.000
Time (UTC)
21:24:18.000
3745.250501 N
Latitude
3745.250501 N → 37.45251°
12224.942773 W
Longitude
12224.942773 W → 122.24943°
5
Fix Quality
Fix Quality Codes: 0 = No Fix 1 = GPS/autonomous 2 = DGPS 4 = RTK Fixed 5 = RTK Float
21
Satellites
Satellites in use
0.83
HDOP
Horizontal precision indicator
23.157 M
Geoid Separation
Height above sea-level (mean), in meters.
1.0
Age of Corrections
Seconds since last RTCM correction
1056*51
Checksum
Integrity check, not data.