I have the Kannad AIS PLB which I understand is the same as the mcmurdo but different branding for US. I also have a brand new Raymarine c125 plotter with current software upgrades as of Feb this year when I bought it and upgraded everything. My AIS is provided by EM-trek.
We did a full live test of the device in the middle of the Caribbean
away from any other shipping
. The C125 alarmed quickly with the same generic sound as all the other general alarms. I had to actively acknowledge to clear the alarm. The target then unfortunately looked just like any other ship - the usual triangle shape.
It seems a shame that they can program a more unique icon to this particular alert given its importance. Would also be nice to have a slightly different audible alert to distinguish it from other alerts. When we use the auto pilot to sail to wind
we can often be in situations where the wind
shift alert goes off far too regularly. This numbs the person off duty to the alarm.