Drone Comparison

EMLID Reach RS4 vs DJI D-RTK 3: GNSS Ground Control Comparison

An expert comparison to help you choose the right equipment for your project.

Feature	EMLID Reach RS4	DJI D-RTK 3
Constellations	GPS, GLONASS, Galileo, BeiDou, QZSS, NavIC	GPS, GLONASS, Galileo, BeiDou, QZSS + L-Band
Frequencies	L1/L2/L5/L6 all-band	L1/L2/L5, plus E6 and B3I
RTK Accuracy	7 mm + 1 ppm H, 14 mm + 1 ppm V	Rover fixed survey: 0.8 cm + 1 ppm H, 1.5 cm + 1 ppm V
Radio Link Range	LoRa up to 8 km; UHF up to 8 km (power limits are regional)	O4 Enterprise — 40 km FCC to a Matrice 400, 15 km to other aircraft
Battery	16 h as an RTK rover with tilt (22 h logging)	7 h base station / 10 h rover / 4 h relay
IP Rating	IP68	IP67
Weight	927 g	1.26 kg (station, without antennas)

Pricing shown reflects average US rates — indicative ranges, not a quote. Actual costs vary by location based on local market conditions, regulations, and project logistics — both within the US and internationally. Get a custom quote

Option A EMLID

EMLID Reach RS4

Multi-Band RTK Receiver with Tilt Compensation

The EMLID Reach RS4 is an all-band GNSS receiver with 672 channels across L1/L2/L5/L6, IMU-based tilt compensation, and 16 hours of RTK rover autonomy. It tracks six constellation systems (GPS, GLONASS, Galileo, BeiDou, QZSS, NavIC) and delivers 7 mm + 1 ppm horizontal RTK accuracy, making it a survey-side instrument for control points, stakeout, and ground control point collection on drone mapping projects.

Pros

672 channels with L5/L6 support
Built-in tilt compensation (RTK + 2 mm + 0.3 mm/°)
Static precision of 4 mm + 0.5 ppm horizontal, PPK 5 mm + 0.5 ppm
16 h as an RTK rover — more than twice the D-RTK 3's 7 h in base-station mode
IP68 sealing and a -40°C to +65°C operating range
Usable as a base station or as a rover for control points and stakeout

Cons

Higher cost than the previous-generation RS3
Requires a learning curve
An 8 km radio link is a fraction of the D-RTK 3's 40 km FCC figure to a Matrice 400
Not a direct drop-in for DJI aircraft pairing the way a DJI base station is

Best For

Survey control pointsConstruction stakeoutGCP collection for drone mappingTilt-enabled rapid surveys

Option B DJI

DJI D-RTK 3

DJI Mobile RTK Base Station with 40 km Transmission

The D-RTK 3 Multifunctional Station is the latest DJI mobile base, using O4 Enterprise transmission rated at 40 km (FCC) between the station and a Matrice 400 — 15 km to other aircraft. It tracks five constellation systems plus L-band for 0.8 cm + 1 ppm horizontal accuracy as a rover in fixed survey, and works as a base station, a rover or a signal relay.

Pros

40 km transmission to a Matrice 400 (FCC)
0.8 cm + 1 ppm horizontal in fixed survey
Base station, rover and relay in one unit
Five constellations plus L-band satellite PPP
IP67, 2 m drop rating, -20°C to 55°C

Cons

DJI ecosystem only
Heavier than the RS4 (1.26 kg vs 927 g, before antennas and pole)
Shorter runtime (7 h as a base station vs 16 h RTK rover on the RS4)
No tilt-compensation specification published

Best For

DJI drone RTK operationsRemote base station deploymentLarge-area surveys

Our Expert Verdict

Depends on Your Needs

These two units solve different halves of the same problem. The D-RTK 3 is a DJI base station built to feed corrections to DJI aircraft over an O4 Enterprise link — 40 km (FCC) to a Matrice 400, 15 km to other aircraft. The EMLID Reach RS4 is a survey instrument — 672 channels, L1/L2/L5/L6, tilt compensation, IP68, and 16 hours as an RTK rover — built for the ground work around the flight: control points, stakeout, and GCP collection. On paper the RS4 is marginally tighter horizontally (7 mm + 1 ppm vs 8 mm + 1 ppm) and slightly tighter vertically (14 mm + 1 ppm vs 15 mm + 1 ppm), while the D-RTK 3 wins decisively on transmission range and native aircraft integration. Many mapping crews carry both.

Choose EMLID Reach RS4 if...

Choose the EMLID Reach RS4 when you need a survey-grade rover as well as a base — collecting and checking ground control points, running stakeout, tracking L5 and L6 in difficult sky, or spending a full day in the field on one charge.

Choose DJI D-RTK 3 if...

Choose the DJI D-RTK 3 when the mission is flying DJI aircraft and the priority is a long-range correction link — its O4 Enterprise transmission and native aircraft pairing are what an EMLID unit is not built to replicate. Confirm your airframe with DJI first: no compatibility list is published on the spec page.

Download the Spec Sheets

Original manufacturer documents, free with no email required — verified against each manufacturer's live copy.

Emlid Reach RS4

Datasheet — 2026-03-23 (LoRa & UHF) (PDF) · 0.2 MB

Source: emlid.com ↗

DJI D-RTK 3 Multifunctional Station

User manual — v1.0 2025.01 (PDF) · 1.4 MB
Relay / fixed-deployment version manual (PDF) · 3.4 MB
Official D-RTK 3 page ↗

Source: enterprise.dji.com ↗

Browse the full library: Equipment Spec Sheets & Downloads →

Frequently Asked Questions

Which receiver is more accurate?

The EMLID Reach RS4 is specified at 7 mm + 1 ppm horizontal and 14 mm + 1 ppm vertical in RTK (4 mm + 0.5 ppm horizontal in static). The DJI D-RTK 3 is specified at 0.8 cm + 1 ppm horizontal and 1.5 cm + 1 ppm vertical as a rover in fixed survey. The two are within about a millimetre of each other on both axes — the meaningful differences are elsewhere.

How far can each unit transmit corrections?

The D-RTK 3 uses O4 Enterprise transmission: 40 km (FCC) between the station and a Matrice 400, 15 km (FCC) to other aircraft. The Reach RS4 provides an 8 km LoRa or UHF link, with radio power limited regionally (in the USA, 0.5 W on LoRa and up to 2 W on UHF). For a large corridor flown with DJI aircraft, the D-RTK 3 link is the practical advantage.

Can the D-RTK 3 be used with non-DJI drones?

It is a DJI-ecosystem device. DJI publishes no aircraft-compatibility list on the D-RTK 3 spec page, and its manual defers to a web link — what DJI does publish is the Matrice 400 spec page, which lists the D-RTK 3 as a compatible RTK station, and the 40 km transmission figure quoted for that aircraft. If your fleet includes non-DJI aircraft, or you need a receiver that also serves as a survey rover, the EMLID Reach RS4 is the more flexible choice.

Does either unit offer tilt compensation?

Both publish one, for different roles. The Reach RS4 publishes RTK + 2 mm + 0.3 mm/° tilt accuracy, so points can be shot without levelling the pole (Emlid publishes no maximum tilt angle in degrees). The D-RTK 3, used as a rover in tilt survey, publishes a 0° to 60° angle range with 8 mm + 0.7 mm/° of tilt and better than 2 cm within 30°.

Which one lasts longer in the field?

The Reach RS4 runs 16 hours as an RTK rover with tilt (22 hours logging) against the D-RTK 3's 7 hours as a base station, 10 hours as a rover or 4 hours as a relay. The RS4 is sealed to IP68, the D-RTK 3 to IP67. For multi-day fieldwork the RS4 needs less battery management.

Can both be used on the same project?

Yes, and that is a common setup. The D-RTK 3 supplies the RTK correction link to the aircraft during flight, while the Reach RS4 collects and checks the ground control points and checkpoints used to validate the deliverable. The two roles are complementary rather than competing.

Equipment Used

Professional Equipment In This Comparison

The professional equipment in this comparison, compared spec by spec. Specifications shown are the manufacturers' published figures. Models THE FUTURE 3D operates are identified on their own pages.

DJI

Current

DJI