LocalStorage Schema

LocalStorage Schema

NavAid persists everything under the navaid.* key prefix. There is no other storage (no IndexedDB, no cookies).

Keys

Key	Type	Default	Notes
navaid.route	JSON string	null	Full route state: { waypoints, legs, notes }.
navaid.lang	"he" / "en"	"he"	Last chosen language.
navaid.layer	string	"CVFR"	Base layer.
navaid.bearing	number string	"0"	Map rotation in degrees.
navaid.toolbarPos	JSON { x, y }	n/a	Toolbar screen position.
navaid.toolbarCollapsed	"0" / "1"	"1" on phones, "0" desktop	Toolbar collapse state.
navaid.yellowAlpha	number string	"1"	Label background opacity 0..1.
navaid.mapOpacity	number string	"1"	Base-map brightness 0.1..1 on screen and in PNG export.
navaid.wpSize	number string	"1"	Waypoint circle / name multiplier 0.6..2.0.
navaid.legArrowSize	number string	"1"	Leg info marker size multiplier 0.3..2.0.
navaid.showNavWP	"0" / "1"	"1"	"Show Navigation Waypoints" toggle.
navaid.showAirfields	"0" / "1"	"1"	"Show Airfields" toggle.
navaid.showWpNames	"0" / "1"	"1"	"Show Waypoint names" toggle.
navaid.wpNameAngle	"0" / "90" / "180" / "270"	"0"	Rotation of waypoint name labels in degrees (cycled by the ⟳ button).
navaid.showReturn	"0" / "1"	"0"	"Show return path" toggle.
navaid.showMidLeg	"0" / "1"	"0"	"Show leg dist" toggle.
navaid.highlightDiff	"0" / "1"	"0"	"Highlight alt/speed diff" toggle.
navaid.sec.<id>	"0" / "1"	"0"	Per-section expand/collapse state. <id> is one of build, view, display, charts, export, print. Accordion: opening one section sets the others to "0".
navaid.pageOrient	"portrait" / "landscape"	"portrait"	Print page orientation, flipped via the ▭/▯ button next to A3 / A4. Saved on every flip; restored on boot.
navaid.aircraft	JSON { gph, taxiGal }	{ gph: 8, taxiGal: 1.1 }	Fuel calculator settings. Filled by the Flight Plan modal's Gallons per Hour + Taxi/T.O. (gal) inputs.
navaid.fpPos	JSON { x, y }	n/a	Flight-Plan modal screen position (draggable via the title bar).

sessionStorage (per-tab, cleared on tab close):

Key	Notes
navaid.fpOpen	"1" while the Flight Plan modal is open — restored across a language switch.
navaid.selected	JSON of the currently selected leg/waypoint/note — restored across a language switch.

This list is normative as of v1.2.

Reading / writing

All access goes through small helpers in core.js / ui.js that catch and ignore storage errors (private browsing, quota exceeded). Failure modes:

• Quota exceeded — NavAid surfaces an alert (errStorageFull) so the user can export the route before continuing.
• JSON parse or schema error on navaid.route - current versions warn and preserve the original saved blob instead of overwriting it with empty state.

Schema of navaid.route

{
  "waypoints": [
    {
      "lat": 32.084,
      "lng": 34.778,
      "name": "TLV"          // required string; use "" for unnamed waypoint
    }
  ],
  "legs": [
    {
      "inboundAltitude": 3000,
      "outboundAltitude": 3000,
      "flightSpeed": 90,                // kt
      "inLabel":  { "a": 0, "p": 44 },  // marker offset: along leg & perpendicular px
      "outLabel": { "a": 0, "p": -44 }
    }
  ],
  "notes": [
    {
      "lat": 32.55,
      "lng": 35.55,
      "text": "climb 4500ft",
      "color": "#ffd84a",
      "shape": "rect"   // or "oval"
    }
  ]
}

legs.length === max(0, waypoints.length - 1).

inLabel / outLabel are marker offsets used by the renderer. Current route JSON validation is strict: all documented fields above are required and correctly typed; extras are allowed for forward compatibility.

Reset / migration

To wipe everything NavAid owns:

Object.keys(localStorage)
  .filter(k => k.startsWith('navaid.'))
  .forEach(k => localStorage.removeItem(k));
location.reload();

Old single-language keys ("Nav", "Heli") are migrated to the new layer names on first load by a small migration shim in core.js.

Naming rules for new keys

• Always prefix navaid..
• Store strings; serialize objects via JSON.stringify.
• Read with try { … } catch (e) { /* storage unavailable */ }.
• Document the key here when you add it.