DF and VDF assistance

Ground-station radio help when lost.

DF steer (AC 100-001 Glossary, DF guidance):

• Headings provided by direction-finding-equipped facilities.
• Followed, leads to a predetermined point, such as the radio direction-finding station or an airport.
• Given to aircraft in distress or on request.

Use VDF:

1. Call a VHF/DF-equipped tower or FSS on the frequency listed in the CFS.
2. Services available:
   • Heading to its site
   • Bearing from the site
   • Track-out assistance
   • ETA or distance
3. Full fix: combine with a second VDF site, a VOR radial, or an NDB bearing.

Controller offers DF assistance instead:

• Hold transmit key down a few seconds, then release, so station can plot you.
• Repeat on a new heading if asked.

Trap: DF steer = heading TO a point (station or airport); single DF contact is not a position fix.

Practice