Hi Jake,
The application is built with the assumption that listings have a zip or some form of postal code.
This information is used to help Google create a map location.
To make the Postal Code non-required:
1. Open your form using the XMod plain text editor and search for the follwing line:
[validate type="required" text="*" message="Company Info: You must enter a Postal Code" class="dnnpNormalRed" enableclientscript="true" /]
Note: I have replaced arrows with brackets to render the code in this forum post.
By removing the above line from your form code, the postal code will no longer be required.
2. On the admin options portion of the form you can bypass the get coordinates function of the latitude and longitude by manually adding the coordinates you describe above and update the form.
Reference:
Why Some Addresses Do Not Show On Your Google Map |