Yeah, I actually just discovered those yesterday. Definitely be keeping an eye out. The few I've found have already made my life much easier.
There are a few things I wish I knew about those scanners when I started. One like you've been using is activating them to find drop pods by searching for shelters.
The other usefull things are searching for Transmission Signals. These will find 1 of 3 things; an Observatory, Transmission Tower, and Beacon.
The most usefull of these for upgrading your gear are the Beacons and Transmission Towers. When you get to a Beacon and activate it, it will find an "Advance Life Form". Head to this waypoint and there will be a little outpost with a single landing pad. Inside will always be a "Multi-Tool" on the wall for sale. Weather it's an upgrade or not is up to the RNG, but if you're looking to upgrade your multi-tool, this is how you find them.
Heading to the Transmission Towers leads to a shelter with a console with a basic puzzle to activate. Once you activate it, it will find a distress signal which leads to a Crashed Ship. Head to the ship and you can either trade for or it or strip out it's upgrades. If it has more slots than your current ship you can trade up, but if not switch custody to the crashed ship(this gives you custody to you can strip it). Now with the wrecked ship is your active ship, head back to your primary ship, go back into the compare screen and break down all of the upgrades on the wrecked ship. Once you have broken everything down, put anything of use into your primary ship, and then switch custody back over to your primary ship leaving the crashed ship gutted from anything useful.
Another thing I wish I knew at the start is how the upgrade system works for the multi-tool and ships. You will only find small upgrades to what you currently have equipped. For example if you have a 10 slot multi-tool you will only find small upgrade/downgrades to your current model. So with a 10 slot multi-tool equipped you will typically find 8 or 12 slot multi-tools. You wont go from having a 10 slot multi-tool and suddenly find a 20 slot tool.
Same goes for ships. If you have a 28 slot ship, you will only run across small upgrade/downgrade versions. This sort of forces you to upgrade your equipment slowly. You won't really be able to just save up some credits and blow it on the best gear early. The gap for ships is a little bigger. With a 33 slot ship, I'm seeing 41 slot upgrades.