The Armed Forces have a policy on Tattoos and Body Piercing as follows:
a. Tattoos. Any tattoo(s) which is/are offensive or obscene will be a bar to entry or re-entry. Additionally tattoos should not be visible on the head and neck. Furthermore any tattoo(s) excessive in size or number may be a bar to entry or re-entry. You may be asked to complete a form describing your tattoos.
You don't want to get a general opinion, you want to get the facts. I would advise you to use the RN website and/or call your AFCO. Plus, use the search function for this site, and you will often find a lot of useful info that has been posted when other people have asked the same questions.
I was there today and had to fill the tattoo performa sheet in.
The guy told me that aslong as they can be covered up, ie by long sleeves and not visible then its fine and ive been cleared for my tattoos.
As I have nothing better to do than paste bits of BRs into message boards, here is the extract from BR81 (Uniform Regs):
h. Body Art (Tattoos):
(1) Tattoos which are visible when No1 uniform is being worn, whether because they extend beyond the collar or cuff, or because they are being worn on the face, neck or hands, are not acceptable, are contrary to current regulations and must not be acquired. Officer and Senior Rate tropical No1 uniform do expose forearms and lower upper arms. Regulations permit the exposure of tattoos in these areas, provided they conform to the rules governing all tattoos wherever they may be.
(2) Tattoos are not acceptable if they are judged by the Commanding Officer, or at the recruiting stage the Recruiting Officer, prior to enlistment into the Naval Service, reasonably likely to:
(a) Undermine the authority or dignity of the Service or bring discredit to the Service.
(b) Offend others or invite provocation, for example because they are
obscene, lewd, crude, or intimidating or are in any way offensive to members of any minority group.
(c) Affect the employability of the wearer, for example by making it
unacceptable for that person to parade or stand guard in public, or,
depending on Branch/Specialisation and career profile, to engage on special operations.
In addition, visible tattoos must not be garish or numerous or particularly
prominent (which will depend on its size and location). Commanding Officers may order personnel with tattoos, which contravene the provisions above, but are not visible in No1 uniform, to cover them up.
(3) Serving personnel who presently have tattoos, which contravene the
regulations will be dealt with on a case by case basis by the chain of command who will make a judgement based on when the tattoo was acquired and under what circumstances. Personnel acquiring tattoos that contravene the Service policy set out at sub para (2), will be invited to have their tattoos removed at their own expense. Acquisition of tattoos in contravention of the regulations and policy will result in disciplinary action and subsequent failure to remove tattoos is most likely to result in administrative discharge SHORE after an appropriate period on warning.