i2c nav gps - problem with Arduino Mini Pro + GY_80

[cossack]

I have 2 MultiWii boards.

1. CRIUS MultiWii SE 2.0
2. Arduino Mini Pro + GY_80

and one I2C-NAV-GPS board.

When I connect I2C-NAV-GPS with [CRIUS MultiWii SE 2.0] Everything works.

When I connect I2C-NAV-GPS with [Arduino Mini Pro + GY_80] nothing works. Even GY_80 stop working and MultiWiiConf shows billions i2c erros. Even negative billions.

I do not add 2.2k pullup resistors to I2C. It seems GY_80 and CRUIS already have them.

Any ideas what may help to make I2C-NAV-GPS work with [Arduino Mini Pro + GY_80] ?

I use same wires without I2C-NAV-GPS.

[cossack]

I have 5V arduino. GY_80 works at 5V. I believe I2C-NAV-GPS is designed for 5v as well.