Simrad RS20 User Manual page 22

Position request acknowledge ("POS ACK")
The radio can be configured to automatically acknowledge
an incoming position request, require manual intervention to
acknowledge, or simply ignore them:
AUTO
Sends current position automatically to calling radio.
MANUAL
Operator must manually choose to send position information.
OFF
All incoming position requests are ignored.
Auto channel switch ("AUTO SWITCH")
This setting only relates to All Ships and Group DSC calls.
When a DSC call is received, it may include a request to change
to a specific channel for subsequent communications. With AUTO
SWITCH set to ON, the radio will switch channels after a 10 second
delay. The radio will also display options to switch immediately, or
reject the request and stay on the current channel.
With AUTO SWITCH set to OFF, any channel change request will
require manual confirmation.
Test acknowledge ("TEST ACK")
The radio can be configured to automatically acknowledge an
incoming test call, or require manual intervention:
MANUAL
Operator must manually choose to send acknowledgement, or
cancel.
AUTO
The DSC test call is automatically acknowledged after a 10 second
delay.
Receive distress while off
Enabling this feature will allow the radio to raise an alert for DSC
distress calls, even when the DSC feature is turned off. This will work
regardless of whether or not an MMSI number has been entered.
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The radio menus | RS20 operator manual