Because this is a Random Only Contest (ROC) stations are encouraged to review the correct procedures for calling CQ and Offset Listening. Please review these procedures prior to the contest plus practice the mechanics of manipulating your rig to easily use the Off Set Method.

Note: The following offsets will result in a contact on a calling frequency and should not be used. This should be obvious however a reminder is given.

Offsets not to be used for calling CQ on the Primary Calling Frequency.
Two meters: CQD15 UrCall or CQ 125 UrCall
Six meters: CQU15 UrCall or CQ 275 UrCall

Offsets not to be used for calling CQ on the Secondary Calling Frequency
Two meters: CQU15 UrCall or CQ 140 UrCall
Six meters: CQD15 or CQ 260 UrCall

The below is copied from the METEOR SCATTER PROCEDURES FOR REGION 2
i.e. The Standard Operating Procedure link is http://www.qsl.net/w8wn/hscw/papers/hscw-sop.html
(This link is provided in the heading on the PJ Page and has long been the accepted standard.)

CQ, OFFSET LISTENING:
FSK441 - If it is apparent that there are several operating, immediately following the letters "CQ", a specific
letter and number are inserted to indicate the frequency that will be used for reception when the CQ
sequence ends.
For example: "CQU5" means "I'm listening and will reply Up 5 kHz."
"CQD8" means "I'm listening and will reply Down 8 kHz".

The offset frequency is always relative to the CQ frequency. Thus, "CQU8" on 144.250 would mean that the contact will take place on 144.258 MHz. (144.250 is not a good frequency for an HSMS CQ, but is simply used as an example). When using FSK441, instead of sending Up or Down, you could specify the actual frequency, such as "CQ 123" would mean "I am listening and will answer on 144.123 MHz."
When the CQing station hears a call on the offset frequency (not on the CQ frequency, for he is not listening there), he/she immediately then also moves to the offset frequency, and the QSO takes place there with BOTH stations now transmitting and receiving on the new designated frequency.

____________________________________________________________________________________

The following is copied from the WSJTGROUP WebPage.

The OffSet Method Explained
Assuming W1AW is calling CQ on six meters 50.260MHz during Random Hour…

1. CQ U7 W1AW (Up 7KHz from calling frequency) W1AW will listen on 50.267 MHz and swap their Tx Frequency from 50.260 MHz to 50.267 MHz after receiving a call.

2. CQ D7 W1AW (Down 7KHz from calling frequency) W1AW will listen on 50.253 and swap their Tx  Frequency
from 50.260 MHz to 50.253 MHz upon receiving a call)

3. CQ F W1AW (Up 6 KHz from calling frequency) W1AW will listen on 50.266 and swap
their Tx  Frequency from 50.260 MHz to 50.266 MHz upon receiving a call)

4. CQ 267 W1AW (Listening on 50.277) W1AW will switch from 50.260 MHz to 50.267MHz after receiving a call.

Note: For method #3 above, the letter indicates the number of kHz higher than the CQ frequency the calling station is listening.
CQC - Up 3 kHz
CQE - Up 5 kHz
CQZ - Up 26 kHz
CQAA - Up 27 kHz.

Assuming W1AW is calling using the OffSet Method during Random Hour on 144.140MHz

1. CQ U7 W1AW (Up 7KHz from calling frequency) W1AW will listen on 144.147 MHz and swap their Tx Frequency from 144.140 MHz to 144.147 MHz after receiving a call.

2. CQ D10 W1AW (Down10KHz from calling frequency) W1AW will listen on 144.130 and swap their Tx Frequency from 144.140 MHz to 144.130 MHz upon receiving a call

3. CQ F W1AW (Up 6 KHz from calling frequency) W1AW will listen on 144.146 and swap
their Tx Frequency from 144.140 MHz to 144.146 MHz upon receiving a call.

4. CQ 147 W1AW (Listening on 144.147MHz) W1AW will switch from 144.140 MHz to
144.147 MHz after receiving a call.