# EOS Arrow Gold

The EOS Arrow Gold is a multi-frequency, multi-constellation GNSS receiver designed for GIS professionals who need sub-meter to centimeter-level accuracy. It tracks GPS, GLONASS, Galileo, and BeiDou on L1/L2/L5 frequencies and supports both RTK and Atlas (Trimble RTX) corrections. The Arrow Gold connects to your phone or tablet via Bluetooth and is managed through the **EOS Tools Pro** companion app. It is widely used in utilities, forestry, municipal GIS, and environmental field mapping.

## Requirements

* **EOS Arrow Gold** receiver, fully charged
* **EOS Tools Pro** app installed on your phone or tablet (available for iOS and Android)
* **Internet connection** on your phone (cellular data for field use)
* **RTKdata.com account** with active RTK credentials
* **Bluetooth enabled** on your phone
* **Survey pole or bipod** (optional, the Arrow Gold has a standard 5/8"-11 thread)
* **Clear sky visibility** — take the receiver outside before testing

{% hint style="info" %}
Don't have an RTKdata.com account yet? 👉 [Start 30-day Free Trial](https://rtkdata.com/try-rtk-corrections-free-for-30-days/) or [View Pricing](https://rtkdata.com/pricing/)
{% endhint %}

## Step-by-step setup

{% stepper %}
{% step %}

#### Power on the Arrow Gold

1. Press and hold the power button for 2 seconds. The LED indicators will light up.
2. **Green LED** = power on. **Blue LED blinking** = Bluetooth discoverable.
3. Wait about 30 seconds for the receiver to acquire satellites.
   {% endstep %}

{% step %}

#### Pair via Bluetooth

1. Open your phone's **Settings → Bluetooth**.
2. Find and pair with **Arrow Gold \[serial number]** in the device list.
3. Accept the pairing request if prompted.
   {% endstep %}

{% step %}

#### Connect in EOS Tools Pro

1. Open the **EOS Tools Pro** app.
2. The app should detect the Arrow Gold automatically. If not, tap **Select Receiver** and choose your Arrow Gold from the list.
3. Once connected, the app displays satellite count, PDOP, and current position accuracy.
   {% endstep %}

{% step %}

#### Configure NTRIP

1. In EOS Tools Pro, tap the **Menu** (hamburger icon or gear icon, depending on version).
2. Navigate to **RTK** or **Corrections** settings.
3. Select **NTRIP** as the correction source.
4. Tap **Add** or **Configure** to enter the NTRIP profile.
5. Enter the following settings. Select the tab for your region:

{% tabs %}
{% tab title="North America" %}

* **Host (domain):** `rtk.rtkdata.com`
* **Host (IP fallback):** `13.56.117.10`
* **Port:** `2101`
* **Username / Password:** From *RTK Credentials* in the internal dashboard (not website login)
* **Mountpoint (ALL CAPS):** `AUTO` (recommended) — or `AUTO_WGS84`, `AUTO_ITRF2020`, `AUTO_ITRF2014`
  {% endtab %}

{% tab title="Europe" %}

* **Host (domain):** `eu.rtkdata.com`
* **Host (IP fallback):** `3.73.41.96`
* **Port:** `2101`
* **Username / Password:** From *RTK Credentials* in the internal dashboard (not website login)
* **Mountpoint (ALL CAPS):** `AUTO` (recommended) — or `AUTO_WGS84`, `AUTO_ITRF2020`, `AUTO_ITRF2014`
  {% endtab %}

{% tab title="Australia" %}

* **Host (domain):** `aus.rtkdata.com`
* **Host (IP fallback):** `54.206.56.130`
* **Port:** `2101`
* **Username / Password:** From *RTK Credentials* in the internal dashboard (not website login)
* **Mountpoint (ALL CAPS):** `AUTO` (recommended) — or `AUTO_WGS84`, `AUTO_ITRF2020`, `AUTO_ITRF2014`
  {% endtab %}
  {% endtabs %}

Also configure:

* **Send NMEA GGA:** **Enabled**

{% hint style="warning" %}
Only these four mountpoints are valid. Always use **ALL CAPS**.
{% endhint %}

6. Tap **Save** and then **Connect**.
   {% endstep %}

{% step %}

#### Verify RTK Fix

1. Return to the main EOS Tools Pro screen.
2. The correction status indicator shows: **Autonomous** → **Float** → **RTK Fix**.
3. The accuracy display will drop from meter-level to centimeter-level once Fix is achieved.
   {% endstep %}

{% step %}

#### Set up mock location (Android)

For Android users who want their GIS app to automatically receive the corrected position from the Arrow Gold:

1. Go to **Settings → About phone** and tap **Build number** 7 times to enable Developer Options.
2. Navigate to **Settings → Developer Options → Mock location app**.
3. Select **EOS Tools Pro** as the mock location provider.
4. Open your GIS app (ArcGIS Field Maps, QField, Mergin Maps, etc.). It will now use the Arrow Gold's RTK-corrected position as if it were the phone's built-in GPS.

**On iOS**, mock location is not available. Instead, configure your GIS app to use the Arrow Gold as an external Bluetooth GNSS source in the app's location settings.
{% endstep %}
{% endstepper %}

## What to expect

* **LED indicators on the Arrow Gold:**
  * Green solid = powered on
  * Blue blinking = Bluetooth active
  * Blue solid = Bluetooth connected
  * The receiver LEDs do not directly indicate RTK Fix — check EOS Tools Pro for solution status.
* **Convergence time:** 20–60 seconds to Float, 30–120 seconds to Fix under open sky.
* **Accuracy at Fix:** 1–2 cm horizontal, 2–4 cm vertical with a quality RTK correction source.
* **Sub-meter mode:** Even without RTK Fix, the Arrow Gold with Atlas corrections can provide sub-meter accuracy as a fallback.
* **Battery life:** Approximately 10–14 hours with Bluetooth and NTRIP corrections active.

## Vertical reference (heights)

{% hint style="info" %}
Heights from RTKdata.com are **ellipsoidal** by default. EOS Tools Pro can apply a geoid model (such as GEOID18 for the US) to display orthometric heights. Go to **Settings → Geoid** to configure this.
{% endhint %}

## Troubleshooting

| Problem                                   | Cause                                               | Fix                                                                                                                                      |
| ----------------------------------------- | --------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------- |
| Arrow Gold not appearing in EOS Tools Pro | Bluetooth not paired                                | Pair in your phone's Bluetooth settings first, then reconnect in the app.                                                                |
| "NTRIP Connection Failed"                 | Incorrect host, port, or no internet                | Double-check the caster address and port `2101`. Verify your phone has an active data connection.                                        |
| "Invalid credentials" or "Unauthorized"   | Wrong username/password                             | Use the credentials from your RTKdata.com RTK dashboard. The username starts with `rtk` — do not use your website login.                 |
| Corrections received but no Fix           | GGA not enabled or poor sky                         | Ensure **Send NMEA GGA** is turned on. Move to open sky — the Arrow Gold needs visibility to at least 15–20 satellites for reliable Fix. |
| Position jumps after losing Fix           | Re-convergence after obstruction                    | This is normal. When you move back to open sky, the solution will re-converge within 30–60 seconds.                                      |
| Mountpoint rejected                       | Typed in lowercase                                  | Enter `AUTO` in all capital letters.                                                                                                     |
| Mock location not working on Android      | Developer Options not enabled or wrong app selected | Verify Developer Options are enabled and EOS Tools Pro is selected as the mock location provider. Restart your phone if needed.          |

## Tips and tricks

* **EOS Tools Pro shows real-time accuracy** in the status bar. Wait for the horizontal accuracy to drop below 3 cm before collecting critical points.
* **Mock location on Android is the recommended workflow.** It lets every app on your phone use the Arrow Gold's corrected position without any special configuration per app.
* **On iOS, use the "External GPS" setting** in apps like ArcGIS Field Maps, Collector, or Survey123 to read positions from the Arrow Gold via Bluetooth.
* **Configure EOS Tools Pro to display the coordinate system** matching your project (UTM zone, state plane, etc.) for easier verification in the field.
* **Keep firmware up to date.** EOS periodically releases firmware updates that improve RTK engine performance. Check the EOS website or contact your dealer.
* **For long field sessions**, the Arrow Gold's 10+ hour battery is usually sufficient, but carry a USB power bank for backup. The receiver can operate while charging.
* **Save your NTRIP profile.** EOS Tools Pro remembers the last used profile, so subsequent sessions connect automatically when you tap Connect.