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Pressure, inspired oxygen and air density at any height. Ladakh to Siachen.
Distance, bearing and back bearing between two points. Or a point from a bearing and range.
Grid reference, lat-long and MGRS, converted both ways.
IST to Zulu, NATO date time group format, and the zone letter for any offset.
BMNT, EENT, twilight, sunrise, sunset and moon illumination.
WBGT, wet bulb, dew point and heat index from conditions you can actually read.
Where you stand and what the gap looks like.
Visible over the crest or not, the clearance, and the dead ground behind it.
Exact service reckoned in years, months and days. Plus date arithmetic forward.
Timed, scored practice. Random grids, bearings and distances, with worked answers.
Plain text into service formats and back.
Azimuth from the altitude of the sun. Orient without a compass.
Calibrate your pace over a measured distance, then convert paces to metres.
Column length, pass time, road space and defile clearance for a vehicle column.
Pressure altitude, density altitude and air density, all in metres.
What a load actually costs you, in watts and calories, over ground and gradient.
Total time, ETA and the full halt schedule for any march.
Dipole, whip, ground plane and loop lengths in metres, from frequency.
Translate Morse, hear it at any speed, and drill the phonetic alphabet.
Radio horizon, optical horizon and Fresnel clearance between two masts.
Path loss, EIRP, received level and fade margin for any link.
Range from the delay between seeing and hearing.
Mils, degrees, grads and milliradians, plus the mil relation solved any way round.
Drone observation aid.
Event reminders that actually go out on the day.
Defence and AI writing. What changed, and whether it matters.