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Frequently asked questions
- The compass points the wrong way, or jumps around.
- Phone compasses are sensitive to magnetic interference: cases with magnets,
magnetic car mounts, and nearby metal or electronics. Move away from the
source and the heading will settle. If iOS suggests calibrating, follow the
on-screen motion.
- Why does it show "M" instead of "T" next to my heading?
- "M" means the app is reading magnetic north because there is no GPS fix
yet. It needs a view of the sky; "T" (true north, corrected for declination)
appears automatically once a fix arrives. Nothing is wrong.
- My coordinates show "—" and speed shows "—".
- Position, true-north correction and speed all come from GPS hardware.
Check that Location Services are enabled for Lubber Line (Settings >
Privacy & Security > Location Services) and that you have a view of
the sky.
- The compass froze and a banner says it needs Location Services.
- On iOS, even the magnetic heading sensor requires Location Services to be
on. Tap "Open Settings" in the banner, enable Location Services, and return
to the app — the compass recovers by itself, no restart needed.
- Speed sits at 0.0 kn for a moment after I stop.
- By design. GPS speed fades over a few seconds, so Lubber Line uses the
motion sensor to pin speed to an honest 0.0 the moment you stop (it never
engages at cruising speed). If it lingers, a small movement will release it.
- How do I set or change my course?
- Point at your desired heading and tap the anchor ⚓ — the course locks and
a cyan arc shows your delta. Tap the anchor again to release. Trim with the
− / + buttons: tap for ±1°, hold for ±10° (repeats while held). Your course
is remembered across restarts.
- Does Lubber Line collect my data?
- No. No accounts, no analytics, no tracking, no ads — your position never
leaves the device. See our Privacy Policy.
- Can I use it for real navigation?
- Lubber Line is a consumer compass. It is not a substitute for certified
marine or aviation navigation equipment.
About
Lubber Line — a marine-style compass for iOS.
True-north correction from the World Magnetic Model, course-steer with a
glowing delta arc, speed over ground in knots, and a butter-smooth upright
rose. Heading comes from on-device sensors; position from on-device GPS.