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.
New: WeatherKit is used to store wind conditions at point of recording. Weather View and Widget.
Features direct 1-click export to Strava when the Strava app is installed on the iPhone, otherwise the Strava authentication form needs to be filled out for export.
Can import multiple tracks with different sampling rates.
MapKit is used to acquire GPS / GNSS 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.
RECORDING FEATURES
-Creates one GPX track with Kalman filtering and another one without. Kalman filtering for altitude can be disabled separately in case pressure sensor data is not reliable, e.g. wind pressure or water impact pressure.
-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, exported by email or directly via Strava. It also supports direct imports by opening any file with .gpx extension that is available locally on the device.
-Storing wind conditions in GPX file
ANALYSIS FEATURES
-Calculates polar plot
-Calculates VMG (Velocity Made Good) on iOS and iPadOS
-Calculates / finds maximum speeds segments over 10m, 100m, 1000m and 1852m.
-Toggle data graph between speed, altitude, course, heart rate (if available) and horizontal accuracy
-Allows to select a segment with marker to calculate distance, time and average speed
-Shows x-axis as time elapsed from recording start or time of the day
-Allows to zoom out / in
-Allows to crop samples
-Supports importing multiple tracks (iOS and iPadOS only) with overlay in the chart metric
-Import filter for GPX files and table sort option on iPad
-Weather for local and favorite location
-Weather widget to not miss the upcoming wind conditions. Widget is showing favorite location.
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 workout will also appear in the iOS Fitness app together with the track log (HealthKit).
-The total distance is shown as a widget or current local wind speed is shown