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From the booklet (http://owntracks.org/booklet/guide/whathow/):

> When the device determines that it's moved a significant distance, it contacts a server via 3G or WiFi (hopefully one of those is available, but we queue messages many thousands on the app until connectivity can be established) and says "hey, I'm here", whereby "here" is specified with a bit more precision.

[According to the documentation:][1]

> When the device determines that it's moved a significant distance, it contacts a server via 3G or WiFi (hopefully one of those is available, but we queue messages many thousands on the app until connectivity can be established)

[1]: http://owntracks.org/booklet/guide/whathow/

I think that'll be a problem. Since you'd be recording your historical data off of the MQTT server, and your phone wont be updating the MQTT server, you'd have gaps in your data. Sounds like you want to record data right on your phone. Some other commenters have mentioned possible alternatives that probably would work better for you.