Read the text and answer the following question.

Ladies and Gentlemen, in case of emergency, take the life jacket which is located under your seat.
Put the life jacket over your head and then fasten the jacket tapes around you‟re your waist.
Do not inflate the jacket until you left the aircraft. The jacket will be automatically inflated by pulling a cord, but if not, you can blow it into the chip to inflate it.
A light is attached to the jacket for attracting attention. The life jacket should be removed only in case of emergency.
The use of TV sets, AM and FM radios and radio cassettes recorders, walkman, and any mobile phones are prohibited on board as they interfere with the communication and navigational system.
We wish you an enjoyable flight.

"... as they interfere the communication and navigational system". The underlined word is similar with____.