The app has been completely self-funded up to this point and has cost tens of thousands of dollars.
That money was originally set aside to pay off their mortgage, but Mrs Walker managed to talk her husband around.
"I managed to convince him that I had this really cool idea and we both decided that we would regret it more if we didn't do it, than if we did it and totally failed."
She has been working on it for just over a year with a team of developers based in Hamilton.
"It's very user adaptable, with new points of interest able to be added by the user. It also includes accessible and child-friendly preferences. I plan for it to totally change the way we travel ... one destination at a time."
Mrs Walker said the app was not designed to take traffic away from other sites and she was planning to work alongside council and Government-run tourism and creative agencies.
"The feedback we have been getting has been awesome, and it's very cool to be able to start working with our Bay organisations to lay the groundwork for the rest of New Zealand."
She said the app will show some basic details for each destination and an image for each point of interest, with links to websites if the user wishes to know more.
The idea was born out of her own travel experience.
"I love travelling and I always found whenever I had a layover or a stopover somewhere, I hated being a tourist. I really hate not being able to do everything that the people who live there do."
Mrs Walker currently works fulltime in quality and market assurance at Zespri and will stay on in that job, running the app on the side.
She has big plans for "The Local Roamer" and wants to eventually roll it out nationally.
"I don't want it to be commercially funded, so I don't want people to be able to buy into it and ruin its integrity."
As for how it would make money, then, she said: "All going to plan our local and regional government agencies would become partners, to showcase what their areas have to offer."
Mrs Walker said this would show their support of local business and give them some control over what visitors see and do while gaining insight from the information the routes and preferences produce.
You can find out more about "The Local Roamer" on Instagram (@thelocalroamer), at thelocalroamer.com or you can email admin@thelocalroamer.com for updates of when the app will be downloadable.