Could you say more about this, for those of us who haven't been yet? Why is the navigation easy? No currents? No places where the exits are difficult/impassible?
Navigation is easy because you are shore diving, basically, in ninety degree angles...
You enter the water from a parking lot and usually swim straight out to a marker buoy that marks the center of the dive site. Take note of your compass heading as you swim to the marker buoy.
There is usually very little, if any, current. You start your dive at the marker buoy by descending along the line and take note of your depth when you get to where the buoy is anchored to the reef (this is important).
You continue your descent along the same compass bearing that you took to get out to the buoy until you hit your target depth. Then you either go left or right along the reef.
When you decide to turn around, you make a gradual ascent back to the same depth as you noted for the buoy anchor and keep swimming along the reef until you inevitably run back into it.
At the surface you will have a visual of the parking lot. But just in case you want to conduct a swimming safety stop, just reverse course from your bearing to the buoy and you will find yourself swimming right back to your car.
You can always also use your finger spool to lay a line from the buoy anchor along your descent just to make sure you don't miss it on the return. This technique is sometimes helpful on dive sites where the buoy anchor is in a flat patch of reef where there isn't a distinct drop off.
Bonaire is that easy.
