80ktsClamp

Good job champ was a bit much, but not knowing "point nine" is official is as bad as the AA guy starting to call himself American Airlines instead of the actual callsign "American."

FWIW, it's unprofessional and potentially dangerous to not use your callsign with the flight number.


AIM 4-3-14

c. The majority of ground control frequencies are in the 121.6-121.9 MHz bandwidth. Ground control frequencies are provided to eliminate frequency congestion on the tower (local control) frequency and are limited to communications between the tower and aircraft on the ground and between the tower and utility vehicles on the airport, provide a clear VHF channel for arriving and departing aircraft. They are used for issuance of taxi information, clearances, and other necessary contacts between the tower and aircraft or other vehicles operated on the airport. A pilot who has just landed should not change from the tower frequency to the ground control frequency until directed to do so by the controller. Normally, only one ground control frequency is assigned at an airport; however, at locations where the amount of traffic so warrants, a second ground control frequency and/or another frequency designated as a clearance delivery frequency, may be assigned.

d. A controller may omit the ground or local control frequency if the controller believes the pilot knows which frequency is in use. If the ground control frequency is in the 121 MHz bandwidth the controller may omit the numbers preceding the decimal point; e.g., 121.7, "CONTACT GROUND POINT SEVEN." However, if any doubt exists as to what frequency is in use, the pilot should promptly request the controller to provide that information.


also from the 7110.65 Air Traffic Control Manual:

2-1-17. RADIO COMMUNICATIONS TRANSFER

1. The facility name or location name and terminal function to be contacted. TERMINAL: Omit the location name when transferring communications to another controller within your facility; except when instructing the aircraft to change frequency for final approach guidance include the name of the facility.

2. Frequency to use except the following may be omitted:

(c) TERMINAL:
(1) Ground or local control frequency if in your opinion the pilot knows which frequency is in use.
(2) The numbers preceding the decimal point if the ground control frequency is in the 121 MHz bandwidth.

EXAMPLE-
“Contact Tower."
“Contact Ground."
“Contact Ground Point Seven."
“Contact Ground, One Two Zero Point Eight."
“Contact Huntington Radio."
“Contact Departure."
“Contact Los Angeles Center, One Two Three Point Four."