Geography guide
Geo Triangulation explained: distance, bearings, and country centers
Geo Triangulation hides one country and lets you spend up to three probes. Each probe gives an approximate center-to-center distance and an eight-direction compass bearing. The skill is combining incomplete clues rather than following a hot-or-cold meter.
What one probe tells you
A probe starts from the approximate center of the country you choose and points toward the approximate center of the mystery country. Daily Geo reports two pieces of information: the great-circle distance, rounded to the nearest 50 km, and one of eight compass directions: N, NE, E, SE, S, SW, W, or NW.
Distance clue
Narrows the mystery to a broad ring around the reference country.
Direction clue
Cuts that ring down to a broad directional sector.
A second probe from a well-separated country can intersect that first region and remove a large part of the map. The third probe is most useful when it resolves two or three remaining plausible areas.
Why the game uses great-circle distance
Earth is not a flat rectangle, so ordinary screen distance is the wrong measurement for a world map. Daily Geo uses the Haversine formula with an Earth radius of 6,371 km to estimate the shortest distance along the surface between two latitude-longitude points.
d = 2R × asin(√(sin²(Δφ/2) + cos φ₁ × cos φ₂ × sin²(Δλ/2)))
The formula operates on latitude and longitude in radians. In the game, the raw result is then rounded to the nearest 50 km. That rounding is deliberate: the clue should guide reasoning without pretending the country centers are survey-grade points.
What “country center” means here
Daily Geo first uses the approximate center supplied by its country metadata. If that is unavailable, the catalog can fall back to a geographic centroid calculated from the country geometry.
A center is a gameplay simplification. Long countries, archipelagos, enclaves, and irregular shapes make any single center imperfect. That is why the game explicitly says distances are measured between approximate country centers rather than between borders, capitals, or nearest points.
How the compass direction is calculated
The game calculates the initial great-circle bearing from the reference center toward the mystery center. That angle is normalized to 0-360 degrees and mapped to the closest of eight compass sectors.
A clue of “NE” therefore does not mean the target lies on one exact line. It means the initial bearing falls closest to the northeast sector. Treat it as a directional wedge.
A practical way to use three probes
- Start broad. Pick a country whose location you know well and that sits away from the center of the world region you are most uncertain about.
- Create a second angle. Choose a reference far from the first one. Two probes from almost the same area tend to repeat the same information.
- Use the third probe only to resolve ambiguity. If the first two clues already isolate a likely country, guessing preserves more points.
If you probe the mystery country itself, the game treats it as a direct hit rather than returning an unhelpful 0 km clue.
Worked reasoning example
Imagine the first probe says the target is roughly 2,400 km northeast. You should not draw a tiny circle at exactly 2,400 km. Instead, think of a broad northeast arc because both the country center and the displayed distance are approximate.
If a second probe from a distant reference says the target is roughly 1,300 km southeast, look for the region where those two broad sectors overlap. A third reference placed on the other side of that overlap can tell you which candidate is more plausible.