1. This map: https://imageshack.us/a/img9/3114/ieor.jpg is the only thing right.
2. When you go to 1 spot, leave immediately if it's not there and check the next. Here's how it works: As soon as 1 gets used, it spawns at the next location, which is random. If you get to one and see positive, the next one that spawns will be negative. Use the OPPOSITE charge on the one you find, IE if you find a positive, use the negative to be launched up onto it. Jump while being launched and do it at a further distance, don't stand right under it.
It's best to do this with a team working together. You can always see them so if someone completes the quest, you can still find them for your friends.