Excavators choosing those locations often will park a vehicle on the beach increasing their overall payout. The most popular locations are ones near the shoreline as they do not require you to have a boat. They can be found by hitting 'M' to open your map and looking for the icons shown below. There are many locations scattered throughout Altis.
Wreck Excavating is a very good legal way of making money and is often compared to Oil running in terms of profit and risk.
