ComNav T300 / K8 RTK Setup: Survey Master NTRIP

Connect the ComNav T300 and K8 to RTKdata NTRIP via Survey Master. Internal modem or PDA CORS, mountpoint AUTO, port 2101, and RTK Quality tips for Fixed.

The ComNav (SinoGNSS) T300 and K8 are GNSS receivers by ComNav Technology. The T300 is a widely used professional survey receiver with a built-in 4G modem, UHF radio option, and multi-constellation tracking. The K8 is a compact, cost-effective receiver sharing the same NTRIP workflow. Both receivers are configured through ComNav Survey Master field software running on an Android controller.

Requirements

• ComNav T300 or K8 powered on with clear sky visibility

• Survey Master field software on an Android controller or tablet

• Internet connection via the receiver's internal 4G modem (SIM card), phone hotspot, or controller mobile data

• RTKdata.com account with active RTK credentials (username starting with rtk and password from your RTK dashboard)

• Survey pole with ComNav adapter

Don't have an RTKdata.com account yet? Start 30-day Free Trial or View Pricing

Step-by-step setup via Survey Master

1

Connect to the receiver

1. Power on your T300 or K8 receiver and wait for satellite tracking to begin.

2. Open Survey Master on your Android controller.

3. Turn on Bluetooth on the controller.

4. Go to Device > Connect and tap Find Device.

5. Select the serial number of your ComNav receiver from the Bluetooth device list.

6. Allow pairing. Survey Master will display the receiver information once connected.

2

Set the work mode to NTRIP Rover

1. In Survey Master, go to Device > Work Config (or Work Mode).

2. Set Work Mode to Rover.

3. Set Data Link to one of the following:

   • Rover NTRIP (or Internal NTRIP Client) — uses the receiver's built-in 4G modem with a SIM card inserted.

   • PDA CORS — uses the Android controller's internet connection (phone hotspot or mobile data). This is useful if the receiver does not have a SIM card.

If using Internal NTRIP Client (receiver modem), you will need to configure the APN for your mobile carrier. Common APNs are pre-stored; select yours or enter it manually.

3

Enter RTKdata.com NTRIP settings

Fill in the NTRIP connection fields. Select the tab for your region:

North America

• IP / DNS Address: rtk.rtkdata.com

• IP fallback: 13.56.117.10

• Port: 2101

• Username / Password: From RTK Credentials in the internal dashboard (not website login)

• Mountpoint / Source: AUTO

Europe

• IP / DNS Address: eu.rtkdata.com

• IP fallback: 3.73.41.96

• Port: 2101

• Username / Password: From RTK Credentials in the internal dashboard (not website login)

• Mountpoint / Source: AUTO

Australia

• IP / DNS Address: aus.rtkdata.com

• IP fallback: 54.206.56.130

• Port: 2101

• Username / Password: From RTK Credentials in the internal dashboard (not website login)

• Mountpoint / Source: AUTO

Type AUTO manually in all capital letters. You can also tap Source List to browse available mountpoints, but typing AUTO directly is faster and avoids source table timeouts.

4

Verify GGA position sending

Survey Master automatically sends GGA position data to the NTRIP caster as part of the standard NTRIP handshake. Verify that:

1. GGA sending is not explicitly disabled in the NTRIP settings.

2. The receiver has at least a standalone satellite fix before the NTRIP connection starts.

RTKdata requires GGA position data to select the nearest base station. Without GGA, the connection will succeed but no corrections will be delivered.

5

Apply and start the survey

1. Tap Enter or Apply to save the work mode configuration.

2. Survey Master will connect to the NTRIP caster and begin receiving corrections.

3. You can verify the connection status under Device Info > Status.

4. Watch the solution status: Single > Float > Fixed.

5. Once Fixed, you are ready to collect points, stake out, or run your survey workflow.

Alternative: Setup via ComNav Web UI

ComNav T300 receivers with built-in Wi-Fi also expose a web-based configuration interface:

1. Connect your phone or laptop to the receiver's Wi-Fi hotspot.

2. Open a browser and navigate to the receiver's IP address (check the receiver manual for the default address).

3. Navigate to the RTK work mode settings and enter the NTRIP parameters as listed above.

4. Apply the configuration.

Known quirk: RTK quality setting

ComNav receivers have an RTK Quality parameter that defaults to Quick on some firmware versions. This mode can produce false Fix solutions under marginal conditions. If you notice unreliable Fix positions, change the RTK Quality setting from Quick to Normal in the receiver's advanced settings. This forces stricter ambiguity resolution and more reliable solutions.

Compatible field software

In addition to Survey Master, ComNav receivers are compatible with:

• CGSurvey — ComNav's alternative field software (PDA CORS mode available)

• Carlson SurvPC / SurvCE — configure NTRIP under Equip > GPS Rover > Internet settings

• MicroSurvey FieldGenius — configure NTRIP under Instrument > GNSS Rover Setup

• SW Maps — free Android GIS/survey app with built-in NTRIP client

Vertical reference (heights)

Heights from RTKdata.com are ellipsoidal, not orthometric (mean sea level). Configure a geoid model in Survey Master under your project coordinate system settings if your project requires orthometric heights.

Troubleshooting

Problem	Cause	Fix
No internet connection (Internal NTRIP)	SIM card or APN issue	Verify the SIM card has data. Configure the correct APN for your carrier.
No internet connection (PDA CORS)	Controller has no data	Verify your Android device has mobile data or Wi-Fi.
Mountpoint not found	Typo or wrong case	Type AUTO in ALL CAPS. Do not include spaces.
No corrections received	GGA not being sent	Ensure the receiver has at least a standalone fix. Restart the rover connection.
False Fix / unreliable positions	RTK Quality set to Quick	Change RTK Quality from Quick to Normal in advanced receiver settings.
Stuck on Float	Poor sky conditions or far from base	Move to open sky. Check RTKdata base coverage at rtkdata.com.
Credentials rejected	Using website login instead of RTK credentials	Use the username (starting with rtk) and password from your RTK dashboard, not your website account.
Bluetooth pairing fails	Device not discoverable	Restart the receiver. Ensure Bluetooth is enabled on both devices. Use Find Device in Survey Master.

Tips and tricks

• The T300's built-in 4G modem provides reliable internet without needing a phone hotspot — insert a SIM card and select Internal NTRIP Client mode.

• PDA CORS mode is the quickest way to get started if you do not have a SIM card for the receiver — it routes internet through the controller.

• Save the work configuration so your crew can reuse it across projects without reconfiguring.

• Check correction age in the Survey Master status display. Values above 5 seconds indicate an unstable internet link.

• ComNav receivers support RTCM 3.2 including MSM5 messages — this is the format RTKdata delivers.

• Keep firmware updated via the ComNav firmware update utility to benefit from the latest RTK engine improvements.

• For the K8, pair with a rugged Android phone running Survey Master for a lightweight, cost-effective RTK solution.

Related Industry Solutions

• Surveying

• Construction