Welcome diginillinois! I have not owned a 505 so I can only share tips re: the Safari. The following is
only a very simplified outline of what I have done to get where I am today.
1. Do not get discouraged with all the tones. When I bought my Safari, it was very discouraging
to hear all these tones and to not be able to figure out what they meant. I almost felt like I had bought a defective detector!! You will find out soon that the many tones are a real asset. If you are prepared to learn, I guarantee you will know what they mean and what kind of target is under your coil after a short while.
2. Build a test garden. Gather a selection of different types of ring pulls (they can register differently) Get some different Karat gold rings, silver ring/s and all the different coins in circulation. Tie bright colored ribbon on them along with a label telling you what they are and where you buried them! and then bury them at different depths etc;
If you don't want to build a test garden, lay these items wide apart on a long plank/s of wood (cannot have any nails or staples in the wood) and sweep your coil over them at different heights. Take lot's of notes on how they sound and the I.D. Use headphones to shut out distracting noises.
3. Detect your own property and see what the sounds are telling you and also what you recover....take lots of notes.
4. Practice, practice, practice and enjoy the thought of knowing you will master the tones soon and be rewarded in coins, relics, gold and silver targets!
Just look at all the previous posts on the forum like Kschae4 advised and the proof that the Safari is an AWESOME machine is in all those recoveries that you will see. Good luck and happy hunting!
P.s. don't be too dependant on what your screen is telling you, rely more on the tones for accuracy and use a small coil (6inch excellerator) if you have the funds to buy one (Kellyco has them) This will help you in target separation and identifying the individual sounds.