GPSlogger Kalman vs Whereday

GPSlogger is a GPS track recorder and mainly a sailing / windsurfing / winging performance analyzer for iPhone, iPad and Apple Watch. The app uses Kalman filtering on GPS and altimeter data to improve accuracy. Recording is unlimited. Imported GPX, FIT or VKX tracks are limited to the first 30 minutes; a one-time in-app purchase unlocks unlimited track length. Record tracks using Apple Watch with GPS, or iPhone/iPad with GPS. WeatherKit stores wind conditions at the point of recording (cellular or wifi coverage provided), viewable in a Weather view and widget. Core Location and MapKit are used to acquire and display GPS location data. On Apple Watch, HealthKit is used to acquire heart rate data and export it into the Health app together with the workout activity. RECORDING FEATURES • Creates one extra track with Kalman filtering for latitude/longitude coordinates and elevation. • Stores wind conditions into the GPX file if available at time of recording. • Stores water temperature into the GPX file if available on Apple Watch. • Works on iOS, iPadOS and watchOS. • Tracks can be pushed from the Apple Watch, imported using the built-in File Importer, or opened from the Files app, Email, or iMessage. • Export using the standard File Exporter. • Export GPX 1.0, 1.1 or Garmin FIT. • Records accelerometer and gyroscope data. • 2Hz sampling with motion-sensor-assisted interpolation. • Captures acceleration (longitudinal/lateral), user direction and rotation rate. ANALYSIS FEATURES • Import GPX, Garmin FIT or Vakaros VKX format, including trim and heel data. • Calculates a polar plot. • Calculates VMG (Velocity Made Good) on iOS and iPadOS. • Finds maximum-speed segments over 2s, 10m, 100m, 1000m and 1852m. • Configurable to show the top 1, 5 or 25 non-overlapping speed segments. • Toggle the data graph between speed, altitude, course, heart rate (if available), GPS accuracy cumulative upwind distance and more if available . • Select a segment with markers to calculate distance, time and average speed. • Direct selection of speed segments in a sortable table. • Finds tacks, jibes and crashes, with direct selection in a sortable table. • Lets you crop samples, decimate by 5, and detect and fix glitches. • Supports importing multiple tracks (iOS and iPadOS only), overlaid on the same chart. • Import filter for tracks, with a sortable table. • Weather for your local and favorite locations. • Weather widget so you never miss upcoming wind conditions — interactive, toggling between local and favorite location. WATCHOS EXTRA FEATURES • Heart rate on watchOS uses linear interpolation between updates, so every GPS sample point gets a valid value in the GPX log. • The workout also appears in the iOS Fitness app together with the track log (HealthKit). • A watch widget toggles between showing total distance and current local wind speed.

Keep a private record of the places you visit and the routes you travel. Whereday helps you review a day on a map, browse your location timeline, and count days spent in each country. YOUR LOCATION JOURNAL • Record visits and GPS routes • Review outings and photos on the map • Add manual visits and correct saved visit times • Record routes on Apple Watch and sync them to your iPhone • Export saved history as JSON, CSV, Markdown, GPX, or KML ACCESS FOR NEW USERS If you first get Whereday with this subscription update or later, choose an Individual or Family plan before starting to track. Weekly and yearly subscriptions include a 7-day free trial for eligible Apple Accounts. Starting a trial requires confirming the subscription with Apple. After the trial, your selected plan renews automatically at the price and billing interval shown before confirmation, unless canceled. Lifetime is a separate one-time purchase with no subscription trial. There is no monthly plan. EXISTING USERS KEEP THEIR ACCESS If you first got Whereday before this update, you keep free tracking. Existing free users still need an export purchase to unlock export features. All previous lifetime purchases remain valid, including Family Sharing on the original lifetime unlock. You do not need to subscribe to keep your existing tracking access or lifetime purchase. YOUR RECORDS AFTER A SUBSCRIPTION ENDS Users who joined under the subscription model can still view and export existing records after their trial or subscription expires. Starting new tracking or adding a manual visit requires active access. Ending a subscription does not delete your records. FAMILY AND PURCHASE SETTINGS Family plans support Apple Family Sharing with up to five other family members, subject to Apple's eligibility and sharing settings. Individual plans are not shared. Prices, currencies, trial eligibility, and renewal terms are shown by the App Store before you confirm. Manage or cancel subscriptions in your Apple Account settings at least 24 hours before renewal. Restore purchases in Whereday using the Apple Account associated with your access. Your location history stays on your device. No Whereday account is required for tracking. Apple purchases, Maps services, optional exports, and limited technical services have the network behavior described in our privacy policy. Privacy Policy: https://whereday.com/privacy Terms of Use (EULA): https://whereday.com/terms Apple Standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/