STM32 and multiple uext modules

[MaroZz]

hello there, sry for dumb questions...But!

This is my first project when i want to use olimexino hardware and there are few moments, what i dont understand

1.UEXT bus
i want combine mod-gps, mod-rs485, mod-gsm, MOD-MPU6050 through UEXT PORT SPLITTER
will this work? no schematics for mod-gps onsite, dunno

2. Power supply
I will use stm32 as base, but how i can calculate needed power for this modules(no info aboud power consumption, except gps), and how much power supply have stm32?