I just installed a SH 2200. ...Is there a device to add to tx ais? Is it worth it?
There is no ADD-ON device to convert a Standard-Horizon GX2200 VHF Marine Band radio into an AIS CLASS-B Transponder. Since there is no device, the "worth" of such a device cannot be estimated.
If you wish to carry an AIS CLASS-B TRANSPONDER, you will have to purchase that device as a separate device, distinct from your Standard-Horizon GX2200 VHF Marine Band radio.
An AIS CLASS-B TRANSPONDER will cost at least $500 and perhaps as much as $800. You will also need a special antenna for it, as the transmitter for AIS operates at a much different frequency than the transmitter in VHF Marine Band ship radios. The typical VHF Marine Band radio antenna used on small boats will not have sufficient VSWR bandwidth to work properly at the AIS frequency. Thus you should allot about $200 to $250 for a new antenna and mount.
Some AIS CLASS-B TRANSPONDERS are sold with only an internal GNSS receiver and antenna. Depending on where the device is installed on your boat, the GNSS reception may not be useful, and an external GNSS antenna or antenna-receiver may be needed. If so, plan on an additional cost of about $75.
Some AIS CLASS-B TRANSPONDERS provide for an accessory remote transmit ON-OFF switch. If you want that function, add about $50.
AIS TRANSPONDER require an marine mobile service identity (MMSI) . I strongly recommend you obtain an MMSI from the FCC instead of from a secondary registration agency. You can obtain an MMSI from the FCC at no added cost when you obtain your SHIP STATION license. An FCC SHIP STATION LICENSE will cost $215 and is good for ten-years.
The total cost of adding an AIS CLASS-B TRANSPONDER will thus be about $915 to $1,315. As for how much value or "worth" having an AIS CLASS-B TRANSPONDER on your boat will bring to you, you are the only person who can assess the cost-benefit ratio.
For a list of CLASS B AIS TRANSPONDERS on the market, see
AIS CLASS B TRANSPONDER ROUND-UP
http://continuouswave.com/whaler/reference/AISB.html