> For the complete documentation index, see [llms.txt](https://support.waderaviation.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.waderaviation.com/importing-your-data/updating-your-records-via-import.md).

# Updating Your Records via Import

When you import flights — whether through email auto-upload or the app import feature — Wader automatically checks whether each flight already exists in your logbook before saving it.    

### Duplicate Detection                                                                      

A flight is considered a duplicate if an existing entry in your logbook overlaps in time with the incoming flight. Specifically, Wader compares block-on and block-off times (with a 5-minute tolerance to account for minor rounding differences between sources). If a match is found, Wader updates the existing record instead of creating a new one.

### What Gets Updated

When a duplicate is detected, the following fields are refreshed with the data from the import file:

* Route (departure and arrival airports)
* Flight number, aircraft registration and type
* Block-on / block-off times, and takeoff / landing times (if provided)
* Pilot role (PIC, SIC, Dual, etc.)
* Operational time values (night, IFR, cross-country, etc.)
* Flight rules and conditions (VFR/IFR, Actual/Simulated Instrument)

### What Is Preserved                                                                        

Fields that you typically fill in manually after the initial import are never overwritten by a blank or missing value. If the import file doesn't include data for these fields, whatever you entered is kept:

* Crew names — names you added or corrected are preserved unless the import file explicitly provides a different name
* Takeoff and landing times — kept if the file doesn't include them (most airline roster files only carry block times)
* Takeoff and landing counts — day/night takeoffs and landings are kept if the file carries no count data
* Pilot Flying / Pilot Monitoring — preserved if not provided by the file
* Approach type
* Runway, SID, STAR, and transition
* Departure and arrival notes and threats
* Remarks / operational notes
* Simulator qualification level

### In Plain Terms

Re-importing the same file is safe. Wader will refresh the operational data from your airline's source while keeping everything you filled in yourself. You won't lose crew names you typed, approaches you logged, or notes you added.


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