How do you read on what is in communication boxes on the VFR terminal area chart?

underline indicates no voice on frequency.

crosshatch indicates shutdown status.

operates less than continuous or on-request

ASOS/AWOS

HIWAS

FSS Radio providing voice communications.

The heavy line box indicates flight service station. (FFS)

121.5,122.2,243.0, and 255.4

Canada 121.5,126.7, and 243.0

are available at many fss and are not shown on the communication box.

certain flight service station. (FFS) provide airport.

Advisory service see A/FD

"R" receive only..

Frequency above thin line box are remoted to NAVAID site.

Other flight service station. (FFS) frequency providing voice communication may be available as

determined by altitude and terrain. Consult airport/Facility directory for complete information.