iPhone app GPSlogger Kalman

Record GPX tracks using Apple Watch with GPS, iPhone or iPad with GPS.
The app uses Kalman filtering on the GPS and Altimeter data to improve accuracy.

MapKit is used to acquire GPS location data.

On Apple Watch, HealthKit is used to acquire heart rate data and to export it into the Health app together with the workout activity.

The feature set has been optimized for water sports activities like windsurfing, kiting, sailing but it is also good for cycling.

RECORDING FEATURES

-Creates one GPX track with Kalman filtering and another one without.
Kalman filtering for altitude can be disabled seperately.

-Works on iOS, iPadOS and watchOS.
On watchOS, works either with GPS paired to iPhone or standalone.

-GPX tracks can be imported / exported with the Apple Files app or exported by email.
It also supports direct imports by opening any file with .gpx extension that is available locally on the device.

-Shows live data.
On iOS and iPadOS it also allows for live data graphs that can be toggled between speed, altitude and course.

-Units can be switched between km/h and knots (nautical miles per hour).

ANALYSIS FEATURES

-Calculates polar plot and estimates wind direction based on symmetry.

-Calculates VMG (Velocity Made Good) on iOS and iPadOS

-Calculates / finds maximum speeds segments over 10m, 100m, 1000m and 1852m.
As an option, finds segments with highest VMGs.
Click on segment to show on map (iOS and iPadOS only).

-Calculates climb / decent.

-Calculates moving time

-Calculates average speed of whole session

-Calculates course

-Toggle data graph between speed, altitude, course, heart rate (if available), horizontal accuracy, vertical accuracy, speed accuracy and course accuracy

-Allows to select a segment with marker to calculate distance, time, average speed, speed VMG and course

-Shows x-axis as time elapsed from start or time of the day

-Allows to zoom out / in

-Allows to crop samples before and after to strip data of the track and save it

-Supports importing multiple tracks (iOS and iPadOS only) with overlay in the chart metric

-Supports import of GPX tracks with sub-second accuracy for the track points.

-Local files (recorded or imported) can be deleted in the app and favorites pinned for quicker access.

WATCHOS EXTRA FEATURES

-The heart rate on watchOS uses linear interpolation between heart rate updates so that each GPS sample point will have a valid value in the GPX log.
The frequency of the heart rate updates depends on workout intensity which is determined by watchOS.

-With watchOS, the workout will also appear in the iOS Fitness app together with the track log (HealthKit).

-On watchOS, the total distance is shown as a complication which updates every 60 seconds.

-On watchOS, uses always-on display to display data.
Data shown can be cycled by screen taps through different screens to trade information against font size.

-On watchOS, run-time (battery) is several hours with always-on display.
Can run even longer when the app is minimized.,

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