Grand Lake St Marys frequencies
Grand Lake St Marys (O12) in St Marys, OH has no control tower, so nobody is sequencing traffic here — you announce your own position on 122.9. Every frequency below is in the order you tune it. · Open on the map
All of Grand Lake St Marys — runways, frequencies, charts and live weatherTaxi & takeoff
- CTAF 122.9
- The common frequency pilots use to announce themselves to each other at a field with no operating control tower. Nobody is controlling traffic — you are self announcing. Report your position and intentions on entry and on each leg of the pattern, and listen well before you transmit.
What to say on 122.9
Nobody is sequencing traffic at O12, so every call is you telling other aircraft where you are. Open and close with the field name so a pilot tuned to a shared frequency knows which airport you mean — 122.9 is not unique to Grand Lake St Marys.
- Inbound, 10 miles out
Grand Lake St Marys traffic, Skyhawk one two three four five, one zero miles south, inbound landing runway 09W, Grand Lake St Marys.
- Entering the pattern
Grand Lake St Marys traffic, Skyhawk one two three four five, entering left downwind runway 09W, Grand Lake St Marys.
- Before taking the runway
Grand Lake St Marys traffic, Skyhawk one two three four five, departing runway 09W, Grand Lake St Marys.
Pattern direction is not always left here — check the O12 traffic pattern before you announce a leg. The Chart Supplement is authoritative if O12 publishes a call name that differs from the airport's. Full guidance →
Every O12 frequency, as one table
| CTAF | 122.9 |
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Frequently asked
What is the CTAF at O12?
Grand Lake St Marys is non towered. The common traffic advisory frequency is 122.9 — announce your position and intentions on entry and on each leg of the pattern.
More about O12
Frequencies from FAA NASR. For planning and education only; always verify against official sources.
Something here wrong or out of date? Report a data problem.