Well, I'm a bit pissed off. I just typed all this and the computer crashed and I lost it all. Brought back memories of the Microsoft of years gone by.... :argh:
I'll try again.
The GPX5000 combined with the original Commander coil should be more user friendly and stable than your SDC2300.
The first thing to check is "What metal do you have in your possession?"
The most obvious, metal in your boots. They might work perfectly well with the SDC but the 5000 will seek out anything metallic within a much wider range. I recently bought metal free boots from Target. They are quite good boots but the zip sets off the 4500 before the coil gets near my toes.
Then there's the phone, leave it back at camp. Mark the camp on your GPS then turn it off before putting it in a pocket somewhere high above the reach of the coil. If it's in your pants it'll pick it up. Mount your PLB well away as well, we have ours in the middle of our back.
The pick can be a problem as well. I've seen people with a magnet screwed into the end of the handle and then then hang it from their belt. It'll upset the detector with every step. Sometimes the head of the pick is a problem at belt height, you just have to relocate it if it gives you trouble. I'm forever shoving mine back out of range.
Perhaps the most important setting is ENHANCED. If you are not running enhanced this simple switch could fix all your problems.
Switch settings;
GENERAL
ENHANCED
MONO
FIXED
Then, hold down the ON/OFF switch on start-up. This will give you the option of resetting factory settings. Choose ALL SETTINGS.
Then, as long as you are away from town and power lines, press the AUTO TUNE and hold the detector steady until it finishes the scan, about a minute.
Then, find a bit of clean ground and ground balance the detector.
Now you should have good stable settings to get you started finding gold in most circumstances. You and tamper with settings further once you become familiar with your detector.
Good luck...