In the skiing and mountaineering world we use climbers (sometimes “lookers”) right/left or skiers right/left to differentiate when facing uphill or downhill. I find having both is helpful instead of just having a single standardized one.

For example, if you are standing and looking at a mountain, it’s easier to say “just to the climbers left of that peak” because it’s on the left from your perspective, likewise when descending it best to say “stay to the skiers left of the rock”.

There’s also lots of times it’s good to mix and match, like if you are looking at and discussing a mountain from afar and planning on skiing down it later, you might keep the conversation from a skiers perspective.