Adding an appropriately encoded APRS string to your node's routine beacon text can be a great way to help advertise your node's availability via the APRS network - BPQ nodes configured for APRS, Direwolf, or even other APRS applications like Xastir connected to direwolf, that are listening on your packet node's transmit frequency can decode the beacon text as if it were a normal APRS packet, and iGate them to the APRS-IS network, where they are accessible to the broader APRS user community. It also allows you to check sites like aprs.fi to see what other packet nodes configured for APRS are able to hear your station's beacons, what times of day, under what band conditions, etc.

N6CTA suggests this format for beacons (via Matrix):

=3405.20N/11748.25WB-0/R -1/B -4/C -5/IRC -7/N DM14cc FARPN

This bit is an uncompressed APRS compatible location and APRS icon for a BBS (N6CTA, Matrix).
The “!” and “=” at the front have different meanings as well, per the spec, whether or not you can receive APRS messages (VE3QBZ, Matrix).

! means no APRS messaging, = means APRS-message-capable (ref).

=3405.20N/11748.25WB

Latitude and longitude coordinates can be converted to the right format using the tool by NA7Q at https://aprs.wiki/converter/.

The rest tells you what SSIDs lead to a particular service (N6CTA, Matrix).

0/R -1/B -4/C -5/IRC -7/N DM14cc FARPN

Another reference: https://wiki.oarc.uk/packet:bpq_nodes_on_aprs