Gps Richmond Virginia

I am flying for the 1st time and have a couple questions. Can I do the following?

I am flying from St. Louis non-stop to Richmond Virginia.
Can I take my GPS system on my carry on bag?
Can I bring my cellular phone?
Anything else you can tell me will be very helpful.
the reason I want to bring my GPS system is because I need to drive around Richmond and havent been there in over 15 yrs.

Hey there, X flight Attendant here. You may bring your cellphone, you can use it in gate area and when boarding the plane, once the front door is shut, the f/a will make an announcement and at that time you are asked to PLEASE turn aaaaall your electronic devices, ALL of them. Your cell cannot be on airplane mode at this point, it has to be completely off. Once you reach an altitude of 10k miles, the f/a will make another announcement saying that “you may now use your portable electronic devices”, you can turn your cell on but ONLY on AIRPLANE MODE.. it cannot send or receive any kind of signal, no texting, no web, no email, no calls.
the reason for this, is because it transmits a satellite signal that may interfere with the flight deck instruments. Since the GPS uses a satellite at all times to find your location YOU CANNOT, AT ANY TIME durig the flight, use that device. If crew sees you using it, they will politely ask u to turn it off, if you insist in not turning it off, count on having a police escort you off the aircraft.
Hope this helps buddy! safe trip!