A/G and FISO or ATC basically do what it says on the tin. A/G not A/A therefore. However if the A/G frequency isn't busy you could say "GAAAA to GBBBB say position" and no-one should take exception since you are the pilot in command responsible for the safety of your aircraft. If it's FISO or ATC you should ask the ground station to find out for you as a courtesy.