loranc

A browser-native rewrite of the QuickBasic plotting tool, built around the original GRI8930 station geometry and TD math.

640 × 480 canvas 100 local slots PNG export

Waypoint

TD entry

Enter the current description and timing differences for the three active secondary stations.

GRI 8930

Description30 chars max

W-Gesashi Y-Tokachibuto Z-Pohang (ROK)

Selection

LOP priority

Use the original auto sort or override it with a manual station order like WY or ZYW.

Auto usability sort Manual order

Manual station orderAccepts W, Y, Z Typed length controls how many LOPs are drawn. Missing stations are appended internally for fix confirmation. Automated fix marker Uses the top two prioritized LOPs and checks for a nearby third confirmation LOP.

Waypoints

Saved slots

Slot 01

Empty slot. Save the current TD set to keep it in this browser.

Waypoints are stored in localStorage on this browser only. Use Export PNG to save the current plot image.

Plot window

Master station Niijima with GRI8930 secondaries

The canvas preserves the original 640 × 480 coordinate system, with a 640 × 464 plotting field and a bottom legend band.

Current description No waypoint selected

Selected slot Slot 01

Plot status

Base map ready. Enter one or more valid TDs, then press Plot.

Validation

TD values set to 0 are treated as missing and skipped from ranking and plotting.

Fix logic

Automated fix marker uses the top two prioritized LOPs and checks them against the third when enough valid TDs are available.

Active order: Awaiting valid TDs

Derived order

LOP ranking

Auto usability sort