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Set up android

Use the ntrip-example repo to stream RTK-corrected position from a clean Windows machine.

Initial setup

  1. Download GNSS Master from Google Play.

  2. Connect the RTK puck to your phone with USB-C.

  3. Open Menu → GNSS, set Mode to USB Serial and Baud Rate to 115200, then tap Connect.

Corrections setup (NTRIP)

  1. Open Menu → Corrections and set Mode to NTRIP Client.

  2. Tap + beside NTRIP Corrections.

  3. Get the device username and password from Point One Devices in the Point One web app, enter the details, then tap Connect.

Verify status

  1. Open Menu → GNSS Status after the puck and NTRIP connect.

  2. Confirm that position and time refresh every second, and Fix type shows RTK Fix.

  3. If RTK Float persists for more than one minute, move the antenna to open skies away from trees and obstructions.

Reading Smart Puck output

Sending GGA:
$GNGGA,212418.000,3745.250501,N,12224.942773,W,
5

Sentence ID + time

$GNGGA identifies GPS/GNSS fix data. 212418.000 is the UTC time: 21:24:18.000.

Latitude + longitude

3745.250501 N equals 37.45251°. 12224.942773 W equals 122.24943° west.

Fix quality

0: no fix · 1: GPS/autonomous · 2: DGPS · 4: RTK fixed · 5: RTK float. The example reports 5.

Satellites + HDOP

21 is the number of satellites in use. HDOP 0.83 is the horizontal precision indicator; lower is better.

Altitude + geoid separation

23.157 M is mean sea-level altitude. −25.328 M is the local ellipsoid-to-geoid difference.

Correction age + checksum

1.0 is the seconds since the last RTCM correction. 1056*51 is an integrity check, not position data.