Answer the question: How precise do I have to be?
- Distances
- Altitudes/Latitude/Longitude
- Models (EGM, WGS, etc)? Ellipsoids?
- Time Durations/Epochs
- Speeds/Accelerations
- Weight
- Angles
- Power
- Energy/Work Done
- Probabilities ([0,1] - [0,100], etc)
- Headings/Bearings
- Azimuth/Elevation
- Temperature
- Frequencies
- Force
- Currency