Jim Corenman has issued a beta release of SailMail (3.5.054) to add support the M803, in which he cautions to use the AF/Mod DB-9 port in lieu of the DIN-8 ACC port for audio and PTT connections to your modem
due to the ACC port being overly sensitive:
Recent changes for Airmail beta ver 3.5.054:
M803: Support for the new Icom
M803 marine radio
is added. "Icom M803" is added as a radio
choice, in Options as well as setup-wizard. The connections are the same as the M802 and previous Icom marine
radios, however the audio-input for the "ACC" connector is way too sensitive, at least for the early radios which we have been able to test. As a result we are strongly recommending using the 9-pin AF/MOD connector which has a high-level audio input level. This will avoid problems with RF feedback and audio distortion. A wiring
diagram is on the Sailmail website, search for "Icom M803" if it is not on the home page.
The upshot is you will need a DB9 -> DIN-8 cable specific to the M803. Note that the AF/MOD port does not provide power to the modem
, so a separate 13.8v. feed to the modem
is needed in addition to the new cable.
Gary Jensen at Dockside Radio is currently providing the required DB9 -> DIN-8 cable, but have not seen it advertised elsewhere...