portapack-mayhem/mayhem-firmware

ADSB Tx - Location Bug

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#3,234 opened on Jun 22, 2026

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buggood first issue

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Description

Describe the bug.

ADSB Tx app. It is impossible to set a Transmit Position location of any longitude with a negative value of between 0.0000 and -1.xxxx. You can set +0.xxxx or -1.xxxx but no value between 0 and -1.xxxx.

For example a longitude value -0.50000 cannot be set.

Full disclosure, I use this functionality to check my avionics inside a hangar! The airport I am at has a longitude of -0.2933 which is impossible to set.

Reproduction

Attempt to set a longitude coordinate of between 0.000 and -1.000 using a manual entry, or the map.

Expected behavior

I expected to be able to select between 0.000 and -1.000

Environment/versions

No response

Anything else?

No response

Contributor guide

Research direction
Inspect the longitude input handling code in the ADSB Tx app. Look for validation or parsing logic that incorrectly handles negative decimals between 0 and 1, such as truncation or bounds checking.
Tech stack
c
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
CGit
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75