RTK GPS for Makers: Why Consumer GPS Drift Happens and How Correction Helps
Posted: Sat Aug 15, 2026 10:50 am
Consumer GPS is magical until you try to map a garden bed or guide a robot and watch the point jump several meters. That is not your module “being cheap” alone — it is physics, geometry, and atmospheric error.
GreatScott!’s RTK GPS project video is a friendly on-ramp into why real-time kinematic correction exists:
https://www.youtube.com/watch?v=y0UkxnTC1p4
Where consumer GPS error comes from
RTK uses a base station at a known location (or a network base) to compute correction data for a rover. With a good fix, position error can drop from meters toward centimeter-class relative accuracy — transformative for surveying-style hobby projects, precision agriculture tinkering, and robotics.
Maker practicalities
If you have tried RTK or high-precision GNSS on a budget, what correction source did you use — your own base, an NTRIP service, or something else — and how solid was it in the real world?
GreatScott!’s RTK GPS project video is a friendly on-ramp into why real-time kinematic correction exists:
https://www.youtube.com/watch?v=y0UkxnTC1p4
Where consumer GPS error comes from
- Satellite clock and orbit uncertainties
- Ionosphere/troposphere delays
- Multipath reflections near buildings
- Limited constellation visibility under trees
- Receiver noise and antenna quality
RTK uses a base station at a known location (or a network base) to compute correction data for a rover. With a good fix, position error can drop from meters toward centimeter-class relative accuracy — transformative for surveying-style hobby projects, precision agriculture tinkering, and robotics.
Maker practicalities
- RTK is a system (base + rover + correction link), not a single “better chip”
- Antenna placement matters more than people want to admit
- “Fix” vs “float” solution states are not the same thing
- Power, radio link reliability, and sky view dominate weekend project success
If you have tried RTK or high-precision GNSS on a budget, what correction source did you use — your own base, an NTRIP service, or something else — and how solid was it in the real world?