Hexadecimal digits only, 0-9, A-F

For Official Use Only (FOUO)

eyes only

night only computer generated image

FEDCON (Federal Employees and Contractors only)

double-action only

once-only approach

admittance by authorized credentials only

interact with character mode files only

Core Only

electrically erasable programmable read-only memory (EEPROM)

Failsafe only

Only arm after successfull EDT handshake

Only flash firmware if you are fully aware what you are doing.

Only MULTI mode currently supported

Return altitude (meters) - only applies in Fixed Altitude mode

RP (increment only)

RPY (increment only)

Heading are only shown when magnetometer is in use

This sets if the TX only beeps one-time versus playing a startup song

Only use to compensate for really bad tunes