Emlid Reach RS4 Pro

01

Two built-in cameras are the confirmed difference from the standard Reach RS4, and the weight gap between them is a separate, unresolved question

The confirmed hardware difference from the standard Reach RS4 is two cameras, one front-facing and one bottom-facing. Those cameras add AR stakeout, points and lines overlaid on the live camera view for layout. They also add measurement from photos, capturing points on facades, behind fences, or across traffic without a total station. Emlid's own product page for the standard RS4 makes no mention of a camera anywhere on it. Emlid's current figures show the Pro weighing about 16 grams more than the standard model, though one independent dealer states a different Pro weight, covered below.

03

RTK holds 7 mm plus 1 ppm horizontally, and static observation tightens that further

RTK, real time kinematic positioning, corrects the receiver's signal against a base station as you work. In RTK mode it holds 7 mm + 1 ppm horizontal accuracy and 14 mm + 1 ppm vertical. PPM means the error grows slightly with distance from base. Static observation, left running over a fixed point, tightens to 4 mm + 0.5 ppm horizontal and 8 mm + 1 ppm vertical. PPK, post processed kinematic, corrects the same signal after the survey and lands at 5 mm + 0.5 ppm horizontal. Tilt compensation adds about 2 mm plus 0.3 mm per degree of tilt. Emlid's own example puts a 30 degree tilt over a 1 km baseline at 18 mm precision. Convergence, the time to lock a fix, runs about 5 seconds.

05

The LoRa and UHF radios change power and range by region, so no flat wattage figure applies everywhere

The built-in LoRa radio runs on 868 or 915 MHz and reaches other Reach receivers only. Emlid's own table sets its output power by region. It runs up to 1 W unrestricted, 0.1 or 0.5 W in the USA and Canada, 0.025 W in Europe, and 0.02 W in Japan. Range follows the same pattern, from 10 km unrestricted down to 2 km in Europe and Japan. The UHF radio runs 410 to 470 MHz on the TRIMTALK 450S protocol and also reaches third-party receivers that support it. Emlid rates UHF at up to 2 W where unrestricted, down to 0.1 W on some Japanese sub-bands, and notes some regions may require a license. One independent dealer states a flat power figure with no region attached, at odds with Emlid's own table. Use Emlid's regional table, and call +1 888 850 6533 to confirm which limit applies to where you will work.

07 FOR UNIVERSITIES, COLLEGES AND GOVERNMENT AGENCIES

The box contents and the receiver's weight both carry unresolved disagreements across every source, so call before you order

What ships in the box is genuinely disputed. Emlid's own product page names only three items: receiver, carrying case and USB-C cable. Two independent dealers we checked instead itemize five: receiver, case, cable, LoRa antenna and UHF antenna, with no battery, bracket or documentation listed separately. Weight carries its own gap: Emlid's current product page and datasheet both state 943 g, while one independent dealer states 920 g. We are not picking a side on either figure. Call +1 888 850 6533, Monday to Friday, 9 am to 5 pm Mountain Time, and we will confirm what ships and which weight applies before you buy. My Surveying Direct is an authorized Emlid dealer, ships direct from the manufacturer, and accepts purchase orders from universities, colleges and government agencies.