Proportional Pathing

[David Armbruster]

This suggestion is probably somewhat related to the option to use a manually set path. Having a way to do a decaying path (e.g. path hop and rate tuning) would be tremendously useful for me.

Existing APRS options rarely offer a way to explicitly do proportional pathing. Bob, WB4APR, has written about it here: http://www.aprs.org/newN/ProportionalPathing.txt

Although to be honest it would be more useful in a mobile setting than fixed. Perhaps this suggestion is more appropriate for an iOS app rather than for laptop/desktop such as QTH. Yet having a status once an hour with wider digipeat with the bulk being local would still be useful.

[Weston Bustraan]

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I’ve been thinking about how to implement proportional pathing. My difficulty is that I was intending to implement a beaconing algorithm for mobile operation similar to SmartBeaconing or GeniusBeaconing. Both of these algorithms vary the rate of beaconing in response to changes in speed, acceleration, turning, etc. The proportional pathing spec seems to be defined in terms of fixed rate beacons, i.e. every minute.

So, for example, if you had SmartBeaconing’s slow rate set to 10 minutes and you were stationary, what would you expect the path to be? Then, when you started moving again, and the rate sped up to, say, every 2 minutes, what would the path look like then? Generally, the faster beacon rate means that the packets contain important positional updates. Would the proportional pathing operate independently of the beaconing algorithm?

[Weston Bustraan]

Implemented in v0.2.0

[Terry Tucker]

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