Editing Digital selective calling (section)

==Other priorities==
The priorities for communication are, Distress, Urgency, Safety and Routine. A Distress DSC call is called an Alert. Urgency, Safety and Routine are called Announcements.

Class A VHFs, used on commercial ships, have the ability to send distress, distress relay, all ships urgency, all ships safety, individual, group, geographic area and telephone alerts/announcements on DSC channel 70 (Digital channel reserved for DSC only.). Class D VHFs, used for most leisure vessels, can send distress, all ships urgency, all ships safety and individual alerts/announcements on VHF channels on DSC channel 70. On both class A and D you can be directed to Ch 06, 08, 72, 77 or other simplex channel for the follow-up RT (radio telephony [voice]) call. Class D has only one antenna and thus can only watch Channel 70 when not transmitting. For routine alerts, which are used to establish communication with another station on a working channel, the receiver acknowledges to confirm that communication can be done on the appropriate channel.<ref name=b43>Bréhaut (2009): 43</ref>

While there are reserved frequencies for [[International distress frequency|distress HF DSC calls]], there is no prohibition against broadcasting non-distress, "routine" calls on other DSC-designated frequencies, which are defined in ITU M.541 as:<ref name="itu-m541">{{cite web | publisher = [[International Telecommunication Union]] | title = Recommendation M.541: Operational procedures for the use of digital selective-calling equipment in the maritime mobile service | year = 2015 | url = https://www.itu.int/rec/R-REC-M.541/en }}</ref>
* 2177, 2189.5&nbsp;kHz
* 4208, 4208.5, 4209&nbsp;kHz
* 6312.5, 6313, 6313.5&nbsp;kHz
* 8415, 8415.5, 8416&nbsp;kHz
* 12577.5, 12578, 12578.5&nbsp;kHz
* 16805, 16805.5, 16806&nbsp;kHz
* 18898.5, 18899, 18899.5&nbsp;kHz
* 22374.5, 22375, 22375.5&nbsp;kHz
* 25208.5, 25209, 25209.5&nbsp;kHz

There is a general consensus for routine calls to use 2177.0, 4208.0, 6312.5, 8415.0, 12577.5, and 16805.0 kHz (the first frequency listed above in each band).<ref name="hfdsc2015" /><ref name="hfdsc2016" /><ref>{{cite web | url = https://ssca.org/forum/viewtopic.php?f=5&t=12613&start=15 | title = Routine HF-DSC Frequencies/Icom M-802 "DSC Watch Mode" Freqs | work = Seven Seas Cruising Association Web Forum | date = 2013-11-11 }}</ref>