  We describe the parameters of a low-frequency all-sky survey of compact radio
sources using Interplanetary Scintillation (IPS), undertaken with the Murchison
Widefield Array (MWA). While this survey gives important complementary
information to low-resolution survey such as the MWA GLEAM survey, providing
information on the subarsecond structure of every source, a survey of this kind
has not been attempted in the era of low-frequency imaging arrays such as the
MWA and LOFAR. Here we set out the capabilities of such a survey, describing
the limitations imposed by the heliocentric observing geometry and by the
instrument itself. We demonstrate the potential for IPS measurements at any
point on the celestial sphere and we show that at 160MHz, reasonable results
can be obtained within 30deg of the ecliptic (2{\pi} str: half the sky). We
also suggest some observational strategies and describe the first such survey,
the MWA Phase I IPS survey. Finally we analyse the potential of the
recently-upgraded MWA and discuss the potential of the SKA-low to use IPS to
probe sub-mJy flux density levels at sub-arcsecond angular resolution.
