Navigation tools
Aviation Calculators
Navigation calculators built on OIBK's tested aviation engine. Each shows its method and assumptions.
Inputs and results use canonical aviation units (kt, ft, hPa, °C, NM, degrees true).
Wind correction & ground speed
- WCA
- 7.3°L
- True heading
- 331°T
- Ground speed
- 103.5 kt
- Headwind
- 5.6 kt
- Crosswind
- -13.9 kt
Method & assumptions
WCA = asin(Vw·sin(Wd − TC) / TAS); GS = TAS·cos(WCA) − Vw·cos(Wd − TC); TH = TC + WCA
- Wind direction is the direction the wind blows FROM, in degrees true.
- Constant wind and TAS along the leg.
TAS, pressure & density altitude
- Pressure altitude
- 5,500 ft
- Density altitude
- 7,321 ft
- ISA deviation
- 15.9 °C
- TAS
- 111.5 kt
- Mach
- 0.167
Method & assumptions
ICAO Standard Atmosphere (troposphere) with subsonic compressible-flow pitot equations.
- IAS ≈ CAS: no instrument or position error correction applied.
- Valid in the troposphere only (up to 36,089 ft pressure altitude).
Distance & bearing
- Great-circle distance
- 194.87 NM
- Initial course
- 338°T
- Final course
- 337°T
- Rhumb-line distance
- 195.38 NM
- Rhumb-line course
- 338°T
Method & assumptions
Great circle: Vincenty inverse on WGS-84. Rhumb line: spherical loxodrome.
- Coordinates in decimal degrees (WGS-84); north and east positive.
Unit conversion
- NM
- 100
- km
- 185.2
- SM
- 115.0779
- m
- 185,200
Method & assumptions
Exact defined constants: 1 NM = 1852 m, 1 ft = 0.3048 m, 1 lb = 0.45359237 kg, 1 US gal = 3.785411784 L, 1 inHg = 33.86389 hPa.
- Temperature conversion is absolute (not a temperature difference).
Fuel planning is available in the Flight Planner. Weight & balance and more calculators are planned.