There are many ways to visualize latitude and longitude data on map using R, such as using ggmaps or RgoogleMaps packages. But these packages generate static maps images only. Leaflet allow users to zoom in or zoom out in a very interactive way.
This R Shiny App allows you to locate your geographic coordinates on Leaflet interactive map.
Check it out Basic R Shiny App of Leaflet - shinyapps.io/LeafletShinyR
For more details, please visit these links.
Leaflet for R - Link
Basic of Leaflet Package in R - Blog
Leaflet R Shiny - Blog
Happy Learning! Your feedback would be appreciated!