gps almanac ephemeris tamper detector — free browser tool | fatcousin

drop gps almanac/ephemeris cache export · detect stale or injected nav data · runs locally

input

drop satellite / gnss log export

csv · json · jsonl · multiple files · local only

Select file

drop gps almanac/ephemeris cache export · local only

limits

heuristic screener · vendor schema varies · not definitive proof

status

>ready