If you don't have perfect pitch, detuning a bass is one way to get a long in those situations - I used to keep a bass tuned in D standard, but... I have perfect pitch, which means my brain would hear "C and try to go to where C is on an E standard tuned bass - a detuned bass was actually tough to play. As I play gigs where any key is fair game (the lead singer determines the key a tune is in), I eventually realized that playing a standard tuned 5 was the best approach for me, as the pitches are where I expect them to be.
One other note about detuning - If you have a bass with a pronounced dead spot, try detuning that one to E flat or D. Changing the tuning on a bass is often an excellent way to "hide" a dead spot. Of course, it can go the other way, as well - a dead spot can appear when you detune.
One other note about detuning - If you have a bass with a pronounced dead spot, try detuning that one to E flat or D. Changing the tuning on a bass is often an excellent way to "hide" a dead spot. Of course, it can go the other way, as well - a dead spot can appear when you detune.