State/ Section/ Region - Kenwood TH-D72A/E User Manual

7 APRS NETWORKS

7.5.3 STATE/ SECTION/ REGION

In contrast to WIDEn-N which generates packets equally in all directions, you can use STATE/
SECTION/REGION to restrict packets to only be relayed within the specified boundary.
Abbreviations, such as two letter "AZ" for Arizona or three or four letter abbreviations such as "NCA"
for Northern California, are used to specify the boundary.
Using these limited regions, it is possible for stations to set up special nets under special
circumstances to communicate over large distances without adding interference to other areas not
involved. For example, using WIDE5-5 from the middle of Maryland would generate hundreds of
packets of interference in 13 surrounding states! This is why nothing larger than WIDE2-2 (two hops)
is recommended. However, using MD5-5 from anywhere within the state of Maryland will get from
any corner to every other corner of Maryland. (13 digipeaters total and with no duplications)
Thus a special Maryland APRS net in support of disaster training can be held without bothering
surrounding states.
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