I now used (and on a different telephone, although this should be irrelevant) a setting of 8 seconds as "GPS timer" option in com.jillybunch.shareGPS : this actually was reflected in the screen update, slower as I intended.
Nonetheless, the T68 seems to work as a map/geo-positioner device, OruxMaps based, for about 6 hours. Which, then again, is not really a problem, having the ability to keep it charged through the car battery.
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