I have an E Series chart plotter with a Smart Radio AIS (much cheaper than the Raymarine model). It seems that the alarm on mine only goes off when there is only one ship in range and it then goes out of range. As long as there are other targets it does not set off the alarm (I have used it in the English Channel and the Straights of Gibraltar). Even with this problem AIS is such a great tool that it's worth having, but it would still be nice if the alarm could be turned off without turning off the AIS.
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