I've currently only tried finding bio signs, so there are probably other issues with geo features I don't know about, but this is pretty much what I would consider minimal necessary changes to the existing system.
- The DSS accessible on foot, in the SRV, and at any height in flight. At present you could easily drive clean out of the zone and newer know it.
- Multiple sample cannisters.
- Some form of directional detector to find things, that can be filtered to exclude things you've already sampled/found. The sampler pulse, with range extended x100 and pings on your compass, might be a good start.