Aviation compass errors can easily confuse a new pilot while flying. Hence, Jason Schappert has created a short video with two acronyms to help pilots remember what type of compass errors they can expect to face in the cockpit.
The first acronym that Jason mentioned was ANDS:
- Accelerate
- North
- Decelerate
- South
In other words and when you are in the Northern hemisphere heading on an easterly or a westerly heading, your aircraft will have a tendency to dip to the north when you accelerate and dip to the south when you decelerate.
In addition, Jason also mentioned a second acronym called UNOS:
- Undershoot
- North
- Overshoot
- South
In other words and when you are in the Northern hemisphere heading on an northern or a southern heading, you have to either undershoot or overshoot your heading. Keeping the above acronyms in mind will go a long way towards aiding navigation while flying.
I use UNOS and ONUS depending where in the world I'm flying. I prefer to keep the acronynms similar.
An easy way to remember which acronym applies to which hemisphere is to think . . . 'the ONUS is on the southerns to use it there'. By deduction, we use UNOS in the northern hemipshere.
… and similarly we use SAND in the Southern Hemisphere.
We always used UNOS but the ONOS is helpful too. thanks!
Learning to fly myself but keeping UNOS quiet as in Czech it means Kidnap or Hijack :))))))) LOL