This article provides guidance how to configure GNSS receiver to operate with Skylark Dx (DGNSS) corrections.

To operate with Skylark Dx the receiver needs to support RTCM v3.2 MSM1 messages.

Look up your receiver to check its compatibility with Skylark: Receiver Compatibility Checker

Receiver Internet Access

The Skylark Dx corrections are distributed over the Internet using NTRIP protocol. A reliable Internet access is required for good navigation performance. A quick guide to establishing an Internet connection to Swift Navigation GNSS receivers can be found in Cell Modems and Network Routers article.

Receiver Configuration

The GNSS receiver needs NTRIP Client software to receive corrections from Skylark Dx. Additionally, the NTRIP Client needs to send NMEA GGA message with receiver's approximate position to Skylark Dx. 

The following NTRIP Client parameters need to be configured: address, port, mountpoint, username, password and GGA message interval.


  • The address depends on the region and GNSS bands:
Bands L1/L2
Bands L1/L5
North Americana.l1l2.skylark.swiftnav.comna.l1l5.skylark.swiftnav.com
Asia / Pacificap.l1l2.skylark.swiftnav.comap.l1l5.skylark.swiftnav.com


  • 2101 for standard connection
  • 2102 for TLS encrypted data stream


  •     DX-MSM1


  • Enter the <username> and <password> as received in the Skylark account activation email. If you don’t have credentials, please create account on Skylark Portal or contact Swift sales team (sales@swiftnav.com) to sign-up.

GGA Interval

  • Set GGA output interval to 10 seconds.



  1. Skylark Dx uses ITRF2014 reference frame.

  2. Skylark Dx provides correction for GPS, Galileo and BeiDou constellations, on L1/L2 and L1/L5 bands.

  3. Skylark Dx sends the following RTCM messages:

  1006 (ANT Pos & Height)

  1008 (ANT Descr & S/N)

  1019 (EPH GPS)

  1020 (EPH GLO)

  1029 (TEXT)

  1033 (REC & ANT Descr)

  1042 (EPH BDS)

  1046 (EPH GAL I/NAV)

  1071 (MSM1 GPS)

  1091 (MSM1 GAL)

  1121 (MSM1 BDS)

Related Articles

Skylark FAQ

Cell Modems and Network Routers