Operational Air Traffic (OAT) rules apply to military operations (e.g., aerial refueling, formation flying) and are not covered by EUROCONTROL General Air Traffic (GAT) rules, which flights typically operate under. Flights default to GAT rules unless OAT is specified. To file a flight plan under OAT rules in ForeFlight Mobile, follow these steps to indicate rule changes at specific waypoints.
NOTE: Flights are normally operated under GAT rules. If the GAT rule is specified at an en route waypoint, the flight portion before that point is assumed to be operating under OAT rules.
STEP 1. Open ForeFlight Mobile.
STEP 2. Create a new flight or choose an existing flight.
STEP 3. Check that the route entered is EUROCONTROL Valid to reduce filing rejections.
STEP 4. Modify the waypoint where OAT rules will start by appending the changeover waypoint with "/OAT", which designates the start of operations under OAT rules.
Example: [waypoint1] [waypoint2/OAT] [waypoint3] [waypoint4] [waypoint5]
STEP 5. Modify the waypoint where GAT rules will once again take over by appending the changeover waypoint with "/GAT", which marks the point where operations revert to GAT rules.
Example: [waypoint1] [waypoint2/OAT] [waypoint3][waypoint4/GAT] [waypoint5]
STEP 6. Select Proceed to File.
NOTE: Rule changes can also be made on the filing form after selecting Proceed to File. Adding rule changes on the Flights page occasionally results in errors, which do not prevent the flight plan from being filed.
STEP 7. Review the flight plan.
STEP 8. Select File.
Following these steps ensures proper filing under OAT rules when using ForeFlight for military operations.
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