Precision Clock Companion

TIME · PRECISION · STANDBY

HOLDOVER TOLERANCES

1 ms 10 ms 100 ms

TIME SOURCE

FORMATS

⚠ {{modesCapNote}}

Tick every mode you want — the buttons cycle them. ON FACE

{{modeEnabledCount}} ENABLED

DATE ROW

WEEKDAY

TIME ROW

ASTRO DATE ROW · SUN / MOON / GRID · TIME ROW KEEPS TICKING

MODE

PAGE DWELL

MS — SUN & LAT/LON PAGE THROUGH THEIR SUB-SCREENS AT THIS RATE (MIN 250)

FACE

BRIGHTNESS {{brightPctLabel}}

DAC CURVE γ {{gammaLabel}}

MASTER DAC — PERCEPTUAL LAW

COLON STYLE

POINT VALUES · DAC CURVE {{dacApplyNote}}

DRAG A POINT · X = SENSOR ADC 0–4095 · Y = DAC BRIGHTNESS 0–4095

PTADCDAC

PRESETS

config.txt — DEVICE USB VOLUME {{cfgName}}

UNSAVED CHANGES

Serial config is write-only — the file is read/written via the mounted clock USB volume (Chromium only). Write-back is gated off by default; re-plug or reboot the clock to reload it.

EMULATOR config.txt — LIVE via the firmware's own parser BETA

APPLY feeds each line through the REAL firmware parser (parseConfigString + postConfigCleanup) and reboots the emulator — exactly as a config.txt does on the device. IMPORT a clock's config.txt to align the emulator to it. {{emuCfgSync}}

CLOCK SETTINGS LIVE OVER SERIAL

Timezone override ▾

Matrix frequency ▾

Time tolerance ms

Simulated position

RE-ENUMERATES USB · ≈3 S

DIAGNOSTICS

TTFF DEVICE ONLY

Diagnostic modes override the face until cleared.

FIRMWARE & DATA

Emulator firmware{{fwVer}}

Source{{fwSrc}}

Built{{fwBuilt}}

ProvenanceBYTE-FAITHFUL — 4363/4363 VS INDEPENDENT TRUTH · ANCHORED TO A PHYSICAL MK IV ON REAL GPS

Timezone data{{fwTz}}

THE CLOCK FACES IN THIS APP *ARE* THIS FIRMWARE — THE REAL clock4 C (ROLLUP: ALL DRAFT PRs) COMPILED TO WEBASSEMBLY AT BUILD TIME, DRIVEN BY A VIRTUAL GPS. THE UPDATE CHECK COMPARES THE BUILT-IN COMMIT AGAINST THE rollup BRANCH HEAD ON GITHUB.

STANDBY — NO CLOCK CONNECTED

You're seeing your computer's system time. Connect your Precision Clock Mk IV for its live, GPS-disciplined data — or explore a simulation if you don't have one to hand.

01 · {{faceRoomCap}}

DATE ROW SOURCE

Send / set below hands the date row to that source.

HARDWARE CALIBRATION drag furniture on the board, or edit the JSON — changes apply to the clock live

{{hwJsonStatus}} x = mm along board · y = mm down the pane

{{hwReadout}}

PRECISION — SIGNIFICANT DIGITSBETA

±{{precUnc}} · significant to {{precDigits}} {{precColon}}

Turn on Significance Fade, drop GPS, and run time-lapse to watch the sub-second digits fade out as they lose significance.

SIMULATION ONLY

OBSERVER — DRIVES SIDEREAL / SOLAR / GRID & THE REAL SKY

LAT LON

TIME ZONE

{{emuTzTag}} The real Mk IV auto-detects the zone from its GPS fix; here it follows your browser’s zone (DST-aware). No fix + no filesystem ⇒ a bare device shows UTC.

ACCESSORIES — FOLD OPEN ON APPROACH

MARQUEE

PRESET

TARGET {{cdTargetLabel}}

No sources yet — add a REST feed (JSON path, regex, or first line of text) and it polls, then push its value to the date row.

Stored in this browser (localStorage) — header tokens are saved in the clear. Auto-pushes each new value (won't stomp countdown / diagnostics).

Weather is coming soon (hopefully).

01 · CONNECTION WEB SERIAL

Port{{cPort}}

Device{{cDevice}}

Framing115200 8N1

Session{{cSession}}

Fix{{cFix}}

Satellites used / in view{{cSats}}

Fix age{{cAge}}

CONNECT DEVICE OPENS A REAL MK IV OVER WEB SERIAL — THE PRINCIPAL USE CASE. SIMULATE RUNS A CLEARLY-LABELLED DEMO FOR EXPLORING WITHOUT HARDWARE (ALWAYS AVAILABLE; ONLY PAUSED WHILE A REAL CLOCK IS LIVE, SINCE SIM AND REAL DATA NEVER MIX). READ config.txt PULLS THE DEVICE'S REAL SETTINGS FROM ITS USB DRIVE (SERIAL CAN'T READ CONFIG BACK).

BROWSER SUPPORT LIVE CHECK

Web Serial API{{supSerial}}

Secure context{{supCtx}}

Engine{{supChrom}}

THIS CONTEXT CANNOT REACH THE CLOCK

Web Serial needs a Chromium browser on https or localhost. The emulator and simulated session still run.

CONNECTION STATES REFERENCE

DISCONNECTEDNo port open — emulator on host time

CONNECTINGPort chooser open / handshake

LOCKEDValid 3D fix, stream healthy

ACQUIRINGConnected, searching the sky

NO FIXSignal lost — always labelled, never hue-only

REBOOTUSB re-enumeration, auto-reconnect

UNSUPPORTEDBrowser gate — see support panel

03 · SKY PLOT N UP · RINGS 30°/60° · SIZE = C/N₀

TRAIL

WINDOW

GPS FIX {{fFix}}

Latitude{{fLat}}

Longitude{{fLon}}

Altitude{{fAlt}}

HDOP{{fHdop}}

Satellites used / in view{{fSatsUV}}

Maidenhead grid{{fGrid}}

CELESTIAL OBSERVER FRAME

Sun alt / az{{cSunAlt}} / {{cSunAz}}

Moon alt / az{{cMoonAlt}} / {{cMoonAz}}

Moon phase{{cMoonPhase}} · {{cMoonIllum}}

Sunrise{{cRise}}

Sunset{{cSet}}

SESSION RECORDED PASSES

Started{{sStarted}}

Passes{{sPasses}}

Observations{{sObs}}

Peak elevation{{sPeak}}

Sky coverage{{sCover}}

GPS {{nGps}} GLO {{nGlo}} GAL {{nGal}} BDS {{nBds}}

04 · C/N₀ VS ELEVATION ANTENNA / MULTIPATH QC

GPS GLO GAL BDS

SIGNAL BARS dB-Hz · DIM = UNUSED

C/N₀ OVER TIME — PER PRN TOP 8 BY SIGNAL · 30 MIN

CONSTELLATION

05 · STATIC-POSITION SCATTER E/N OFFSET FROM RUNNING MEAN

WINDOW

EACH FIX = ONE SAMPLE · AGE-FADED

PRECISION THE CONFIDENCE FIGURE

CEP 50%

2DRMS 95%

σ east / σ north{{pSigE}} / {{pSigN}}

Mean latitude{{pMeanLat}}

Mean longitude{{pMeanLon}}

Fixes in window{{pN}}

Time to first fix{{ttffLabel}}

DOP HISTORY HDOP — · PDOP – – · VDOP · ·

FIX CONTINUITY TYPE BAND + SATS USED

06 · TIMING — PPS HOST-TIMESTAMPING {{ppsBanner}}

PHASE JITTER RMS

PEAK-TO-PEAK

OSC DRIFT

{{tDrift}} ppm

HOLDOVER

{{tHold}} s

DIE TEMP

{{tTemp}} °C

PPS EDGES

DROPPED {{tDrop}}

PHASE AT PPS EDGE MEDIAN-CENTRED · ROBUST ±1σ BAND

CAPTURED IN FIRMWARE AT THE EDGE (SYSTICK ≈12.5 ns) — USB TRANSPORT JITTER NEVER TOUCHES THIS NUMBER.

OSCILLATOR DRIFT + DIE TEMP CAL WINDOW 63 s → STAIRCASE

ppm = calerr · 10⁶ / (32768 · 63) — ONE STEP PER SUCCESSFUL RTC CALIBRATION.

DRIFT VS DIE TEMP {{fitStatus}}

THE 32 kHz TUNING FORK'S PARABOLA — FITTED CURVE IN AMBER.

TEMP COMPENSATION — SOFTWARE TCXO HOST FIT · CROSS-CHECK OF ON-DIE LEARNING

k0 / k1 / k2 (ref 25 °C){{fitK0}} / {{fitK1}} / {{fitK2}}

Samples{{fitN}}

Temp spread{{fitSpread}}

Fit residual RMS{{fitRms}}

Compensation state{{compState}}

{{compLine}}

$PMTXTS TIMESTAMP + DIE-TEMP COME FROM DRAFT FIRMWARE PRs (pps=on). THE HOST FITS ppm(T) FROM THE RTC CAL ERROR — THE LSE CURVE — AND EMITS THE FIRMWARE'S tc_* SEED BLOCK (PASTE INTO config.txt; tc_seed=on LAST WARM-STARTS THE ON-DIE LEARNER). tc_dump ON THE CLOCK STAYS CANONICAL — THIS IS THE HOST'S INDEPENDENT ESTIMATE OF THE SAME CURVE. WHILE LOCKED, calibrateRTC OWNS CALR; ABSOLUTE UTC OFFSET ISN'T RECOVERABLE OVER USB (≈1 ms FLOOR), SO THE APP SHOWS JITTER, STABILITY AND DRIFT.

07 · GLOBE ORTHOGRAPHIC · DRAG TO ROTATE

READOUTS LIVE

Sub-solar point{{gSub}}

In view at observer{{gVis}}

Observer grid{{fGrid}}

NOTES

SATELLITES AT SUB-SATELLITE POINTS · TRAILS = GROUND TRACKS · OBSERVER MARKED GREEN.
{{landNote}}

08 · MAP GROUND TRACKS — WORLD · EQUIRECTANGULAR

SATELLITES AT SUB-SATELLITE POINTS · SUN GOLD · OBSERVER GREEN

08 · CONDITIONS AT FIX OPEN-METEO · KEYLESS

Temperature{{wTemp}}

Feels like{{wApp}}

Sky{{wCode}} · {{wCloud}}

Humidity{{wRh}}

Pressure MSL{{wMslp}}

Wind / gust{{wWind}} / {{wGust}}

Precipitation{{wPrecip}}

Updated{{wAsOf}}

Point forecast at{{wPos}}

WEATHER UNAVAILABLE

Open-Meteo could not be reached. The clock and GNSS views are unaffected — weather returns when the network does.

PROTOTYPE CONTROL

PUSH TO CLOCK TEXT MODE

REFRESH

Sends as text mode — marquees automatically past 10 characters. The date row carries the message; time keeps ticking.

09 · SERIAL MONITOR — RAW NMEA {{monRate}}

RX TEXT · TX RED · ERR ORANGE

TELEMETRY LOG — PERSISTENT BETA INDEXEDDB · CONNECTED ONLY

Persists your Precision Clock's live stream — position, satellites, temperature, clock skew — to this browser so you can rewind and scrub through it later. Opt-in, off by default. A simulation is NEVER logged. Nothing leaves your machine.

{{telStat}} KEEP

REWIND · SCRUB BETA {{rvTime}}

Drag the timeline to scrub. Hatched spans are CLOCK DISCONNECTED — no data recorded.

POSITION

FIX

SATS

TEMPERATURE

CLOCK SKEW

No recorded telemetry yet. Turn on LOG MY CLOCK'S DATA above, connect your Precision Clock, and its stream lands here to rewind through.

10 · SESSION IN-MEMORY

Started{{eStarted}}

Duration{{eDur}}

Position fixes{{eFixes}}

Satellite observations{{eObs}}

NMEA lines held{{eLines}}

PPS samples{{ePps}}

SESSION LIVES IN MEMORY — CLEARED ON RELOAD.

RECORDED DATA DOWNLOADS

POSITION CSV

Fix time series — lat/lon/alt, E/N offsets, DOP, sats, fix type

SESSION JSON

Full session — observer, stats, satellite snapshot, PPS fit

STRUCTURED

TRACK GPX

Fix track for GIS tools — 1 point / 5 s

SATELLITE CSV

Sky history — az/el per satellite (1 pt / 30 s) with nearest C/N₀

RAW NMEA

Received sentences as captured, checksums intact