Eötvös Effect: Calculation

Equation

To manually calculate vertical Coriolis deflection (or the Eötvös effect), we need to know:

• The latitude of our position
• Our compass bearing
• The time of flight for our bullet

(.00007292 * cos(latitude°)) * (sin(azimuth°) * (Time of flight in seconds) * 1000 = Vertical deflection in MRADs

Where:

• positive outputs =  higher point of impact
• negative outputs =  lower point of impact

Data Collection

Time of flight can be found in the ATragMX under the “RC” button in the top right of the screen or derived in an online ballistics program. As the ATragMX suite is not available in situations where manual ballistics are relevant, time of flight information should be recorded prior to operation start.

Bearing can be determined by aligning the in-game compass with the target.

Map latitude in Arma 3 does not always correlate with real word locations, rather this information is manually populated by map makers and is persistent for an entire map. Latitudes for common UNITAF campaigns are listed below: