Tiny Mobile RTK.

Most centimeter-grade GNSS workflows still require a survey pole, a tripod, and a separate handheld controller. The Tiny Mobile RTK folds that whole rig into a single object that lives on the back of a phone — held with cırt bant velcro.

The receiver speaks to a field-tuned mobile app over Bluetooth. One device, one hand, one capture motion.

The mounting surface is honest about what it is — industrial hook-and-loop. It survives heat, dust, gloves, and a working day of repeated detach/attach. The receiver is featherweight enough to stay there without flexing the phone case.

The shell geometry was tuned so the antenna sits proud of the phone’s metal back — keeping the GNSS signal path clear of the handset’s own RF interference.

Inside one compact ABS housing: a multi-band GNSS antenna, an IMU for tilt compensation, and a laser module that projects the target point straight down to the ground.

The hard part isn’t fitting them. The hard part is keeping their axes co-aligned across drop, temperature drift, and ten thousand attach cycles. The PCB carries them as a single rigid stack so their relative geometry never moves.

The shell is 3D-printed in ABS using a 0.2 mm nozzle. That nozzle size was a deliberate compromise — fine enough to hit the tolerances the antenna and laser bores demand, coarse enough to keep print times sane for a small production batch.

ABS was chosen for its thermal envelope. A surveyor’s phone in direct sun can run hot; the housing has to stay dimensionally stable so the laser axis doesn’t drift relative to the IMU.

The bottom-facing laser is the bridge between the digital fix and the physical world. It puts a visible dot on the ground at the exact point being captured — so the surveyor doesn’t have to trust the screen alone.

Combined with IMU tilt compensation, the system targets 2 cm of error at 2 m of standoff — enough that you can stand naturally over a feature instead of bending the phone perfectly vertical.

Every captured frame is stamped with an RTK-grade location and IMU pose. The result is a photogrammetry pipeline where each photo carries real-world coordinates — meshes and orthophotos land in the right place without a separate ground-control pass.

The mobile app was redesigned around the way surveying actually happens outdoors: bright sun, one free hand, gloves, wet hands, and divided attention. High-contrast type, oversized targets, a single primary action.

Tiny Mobile RTK is shipping in 2025 as Geodo’s first hardware product, designed end-to-end with Fryk Works. From PCB stack-up to print path, from laser bore to button copy — one team, one housing, one alignment.

A surveying instrument that lives in your pocket.