Navigate through changing GPS.
Rahbar keeps pedestrian motion processing active when GPS quality declines and uses future valid fixes to correct the fused estimate according to their quality.
GPS / PDR FUSION RAHBAR / NAVIGATION SDK
Your app.
Their next
adventure.
Bring reliable, motion-aware positioning to your outdoor app—from trail hikes to urban walks, even when GPS is unreliable or unavailable.
Built for the way people move outdoors.
OUT THERE, EVERY STEP MATTERS.
THE EXPERIENCE IS YOURS.
The positioning
is Rahbar.
FOR TEAMS BUILDING Hiking apps Trail experiences Outdoor navigation
01 / THE SDK
A pedestrian navigation core.
Your product on top.
Rahbar is an offline-first iOS navigation SDK that combines Core Motion, GPS, pedestrian dead reckoning, and uncertainty-aware fusion. Your app receives a fused position designed to continue through degraded or unavailable GPS conditions.
Keep uncertainty visible.
Position output includes horizontal, directional, and vertical uncertainty plus quality and degradation states, so your app can make informed decisions.
QUALITY-AWARE OUTPUTOwn the complete experience.
Your app owns maps, routes, UI, persistence, and sharing. Rahbar requires no account or network connection for navigation and does not upload coordinates, tracks, or diagnostics.
OFFLINE-FIRST02 / UNDER THE HOOD
Sensor input in.
Fused position out.
Rahbar combines iOS Core Motion attitude and inertial data with GPS, Core ML pedestrian motion inference, and uncertainty-aware GPS/PDR fusion.
The host app may also supply independent absolute or relative position measurements. Rahbar applies them according to their stated uncertainty rather than treating them as hard teleports.
Talk through your integrationFROM SENSOR INPUTS TO APP EXPERIENCE
Core MotionGPSHost measurements
Rahbar SDKGPS/PDR fusion + Core ML inference
COREYour iOS appFused position + uncertainty + motion
Rahbar owns acquisition, normalization, fusion, inference, uncertainty, calibration, and session tracks. Your app owns the user experience.
03 / INTEGRATION
One framework.
Two position modes.
Add the signed XCFramework to an iOS app, choose how position should be expressed, and consume fused updates through a single long-lived RahbarNavigation instance.
iOS 17+Swift APIOffline navigationNo account requiredPhysical iPhone for field testing
OUTDOOR / GEODETIC
Latitude and longitude
Use fused geographic coordinates for trail, urban, and map-based navigation. Start from the first valid GPS fix or a known coordinate.
INDOOR / RELATIVE ENU
North, east, and down
Start from a relative origin and render meter-based output against a floor plan. Independent relative measurements can refine the estimate.
Add and authorize
Add RahbarSDK.xcframework as Embed & Sign, import RahbarSDK, and provide Location and Motion usage descriptions.
Choose the configuration
Select .geodetic or .relativeENU, the initial GPS-fusion state, and whether active navigation may continue in the background.
Run the lifecycle
Create one RahbarNavigation, request authorization, call start(), then begin a session from automatic GPS, a manual coordinate, or a relative origin.
Consume fused updates
Use position for navigation, including its uncertainty and source. Use motion, calibration, lifecycle, and quality fields to explain current behavior. Keep rawGPS diagnostic-only.
SWIFT / OUTDOOR PILOTRahbarSDK
import RahbarSDK
let config = RahbarConfiguration(
positionOutputMode: .geodetic,
gpsFusionEnabled: true,
allowsBackgroundLocationUpdates: true,
showsBackgroundLocationIndicator: true
)
let navigation = try RahbarNavigation(
configuration: config
)
_ = navigation.requestAuthorization()
Task {
for await update in navigation.updates {
let fused = update.position
let gps = update.rawGPS // diagnostics only
let quality = update.quality
}
}
try navigation.start()Field-test on a physical iPhone.
The Simulator can validate API integration, but it cannot reproduce real motion, GPS, uncertainty growth, background behavior, or battery use.
PILOT EVALUATION TOOLS
See what fusion changes.
Compare estimates
Plot Rahbar’s fused position and uncertainty separately from raw GPS and its reported accuracy.
Simulate a GPS outage
Disable GPS corrections at runtime while raw GPS remains visible, then observe PDR behavior, uncertainty growth, and recovery.
Add known observations
Inject absolute or relative measurements with realistic uncertainty. Rahbar weights the correction instead of snapping to it.
04 / TAKE IT OUTSIDE
Start with a walk.
See where it leads.
RAHBAR SDK IN ACTION
Explore Rahbar’s positioning capabilities through our iOS evaluation app, from a trail on USGS Topo to an urban walk on Apple Maps.
Request an evaluation
See the trail in context.
Follow a recorded path alongside terrain contours and landmarks. The evaluation app also supports downloadable USGS Topo maps for offline use.
Stay on track beyond GPS.
The recorded path remains continuous as the user moves from the street through a building complex—an environment where GPS-only positioning commonly degrades or drops out.
Find your next waypoint.
See distance and direction cues to a selected waypoint as you move, alongside positioning and altitude estimates.
Screenshots from the Rahbar iOS evaluation app. SDK scope and integration requirements are discussed separately.
LET’S BUILD WHAT’S NEXT.