Is there an app with a map of nearby people willing to trade bitcoin?.
Do you mean any kind of application that involves maps in order to find a place to trade Bitcoin? If you refer to the personal person that is trading BTC, I don't think they will use it. Sometimes, trading BTC is a secret because it relates to their safety life. Therefore, they won't need to be noticed in their location. Imagine that you can know the traders of the BTC with that much of amount, it will be dangerous for him. Probably, some people may arrange such bad things to harm the person. Probably. It means that trader will commonly prefer to anonymous, everything about it, not to be revealed.
But, if you mean everything or something that accepts BTC to trade or to use it for payment, probable you can check the following information. I found some, but they are not to refer to where the personal trader. It is more to notice the place where Bitcoin can be traded or used for some kind of payment.
1. Bitcoin Map
It is already available in the Google play store. This application gives you information about the stores that accept BTC as one of the payments around you. It also provides details of the store. But, some people said that this application is outdated, still to be upgraded in order to widen the location and possibilities.
2. Bitcoin ATM Map
Well, actually this application doesn't tell you where the trader of the Bitcoin, just show where you can exchange or trade your BTC to cash or others through the ATMs. You can find BTC ATMs easily around you using this application. The most popular application is CoinATMRadar where it is available on Google Playstore or Apple store. It is not only to notice you where to trade or exchange the BTC but also other cryptocurrencies. The other almost similar app is Bitcoin World Map
3. Coinmap
This is also almost similar to Bitcoin Map, it offers the information about the locations where some merchants accept Bitcoin to be payment. You can use it in the groceries, cafe, and more. But it doesn't tell you the trader of BTC.
Sources:'
https://thedroidguy.com/5-best-bitcoin-map-apps-2019-1079113https://news.bitcoin.com/maps-for-merchants-accepting-crypto/