If you are planning to install the DVD/Nav unit yourself, then the only costs are the cost of the system you choose to fit.
If you prefer to have an installer fit it for you, then expect to pay approx. $150-200.
See the following video guide for more info on what level of work is required to swap out the unit:
Hi and thanks, ***** ***** in the video was from a 2007 CR V. Is it the same for a 2012 and if the vehicle didn't come with the navi system, would it have the gps plug or would I have to change the complete harness to fit the new unit?
Yes, it is a similar process for the 2012 CRV.
If the vehicle did not have a factory fitted nav system then there won't be a GPS plug and you will need to fit an additional harness.
would you have directions / work involved in replacing or adding that extra harness?
When you decide which unit you want to install, enter the model number on www.crutchfield.com to obtain the correct harness. Insallation is straightforward - see the following installation videos: