Support

Something wrong, or a number you disagree with? Write to weightscheck@ismailov.net. If it is about a figure the app showed, include the suit, the cylinders, the water and the lead you had fitted, and whether the rig had a recorded check behind it — that is enough to reproduce anything on the screen. Settings › About carries the version and build number; a report that names it saves a round trip.

Common questions

Why does it show a range instead of one number?

Because a rig you have not yet checked in the water is an estimate, and printing one figure would hide that. The suit is the largest unknown — a published buoyancy for a wetsuit carries a wide band new and a wider one aged, and every kilogram of error there moves the answer at 30 m by about half a kilogram. So both ends are printed. Record a check and the range narrows, because the check measures what your whole rig actually did in the water.

I changed the lead and the figure at depth did not move.

Before you have recorded any check at all — on this rig or on any other — that is the arithmetic being honest about what it cannot see. Lead is the same weight at every depth, so it appears on both sides of the calculation and cancels. The app says so on the screen rather than hiding it: "Assumes this rig holds 3 m neutral with 50 bar left, wing empty. The lead you carry is not in this figure." Record one check anywhere in the app and that changes: the rig borrows the lead you were actually measured with, and from then on moving the lead moves the figure — by roughly nine-tenths of a kilogram for every kilogram you add.

What is the drawing at the top of a configuration?

The dive on one scale: where the rig sits at the check, where it sits at depth, and the gap between them. Above the zero line floats, below it sinks, and that line is labelled in words because the convention is not obvious the first time you see it. There is one colour, both ends are drawn the same way, and nothing on it is trying to tell you the deep end is the bad one — that is your call, not the app's.

Why does it ask my weight?

Once, in Settings, and for one purpose: your mass gives the app your volume, so a check you recorded in the sea can be carried into fresh water. Without it the app declines to answer for water other than the one you were checked in, rather than being wrong by about two kilograms: carrying a fresh-water check out to the sea under-calls the lead, and too light is the end where you cannot hold your stop. Height, sex and age are optional and only narrow the starting estimate for a rig with no check anywhere. No figure about your body is ever printed back at you.

Why did it refuse to answer?

Because answering would have meant inventing something. The commonest cause is a stage bottle the anchoring check did not carry: its gas swing is not in the model, it is worth more than two kilograms in the direction that makes a rig read lighter at depth than it is, and no caution attached to a wrong number fixes that. Record a check with the stage on and the refusal lifts.

Does it work without a signal?

Always. The app has no network access at all, so a boat with no reception changes nothing.

Will it tell me my weighting is right?

No, and it never will. It keeps your record and does the arithmetic on it. Above a threshold you can change it warns you; below it, you get the number, plus or minus, and nothing else — no tick, no colour, no verdict. The check that counts is the one you do in the water, and your training comes before anything on this screen.