Hi support171,
Just gone through your job post "Repair, Maintain (and possibly upgrade) existing online mapping interface" and understood your needs. Although I am here but I have a team of 10+ web and mobile application developers.
We can definitely help you in doing your project "Repair, Maintain (and possibly upgrade) existing online mapping interface" & we assure you that we will deliver you great work as we have expertise in Cartography & Maps, HTML, Javascript, MySQL, PHP.
I can do this within your budget too min $50 USD / hour
Due to word limit I can't write more so I request you to initiate message board.
Thanks
On my business website I have an existing online mapping interface built for subscribing customers about 6 years ago.