Careful when employing the Glide method over really tiny Moons
The "handover point" (momentary jump in Altitude readout - above no POIs will be shown on the Scanner, one needs to be below it) can be as low as 12km or less on some super-tiny moons.
So don't find yourself Gliding from 55km downwards over and over, wondering why you never find anything.
The Altitude Window on these mini-potatoes for POIs to show up in Glide phase is very slim. Quite difficult to properly employ it, since the window of opportunity is so small.
If you're not below that handover point while about to cross the area of Interest - you're guaranteed to miss the Volcanism POI.
(obvious hint : Scanner set to Max. Range? Forgetting that - been there, got the T-Shirt

- can easily ruin your day

)