title: Mapping in R with maps package
body: <p>I am currently trying to generate a map in R demonstrating where my different sampling locations are along the east coast of Canada. I had my code working previously yesterday and was able to visualize the specific area I wanted to look at, and then layer my point on top.
  This morning however, when I open the project back up and try to generate the map with this line of code:</p>
  <pre><code>map(&quot;worldHires&quot;, &quot;Canada&quot;, xlim=c(-80,-45), ylim=c(40,60), col=&quot;gray90&quot;, fill=TRUE)
  </code></pre>
  <p>I get the output [[1]] NULL. This is not trying to plot the sampling locations yet, just generating a blank map which I will plot the points over. All the necessary packages (to my knowledge) are loaded (maps, mapdata, maptools, scales) and I don't understand why it was working fine yesterday but today I am only getting this output. I have tried with other regions as well and no matter what I put into the argument it only returns NULL.</p>
  <p>I have also tried just entering the line:</p>
  <pre><code>map(&quot;world&quot;, xlim=c(-80,-45), ylim=c(40,60), interior=TRUE)
  </code></pre>
  <p>However when I do this I get this error: Error in as_mapper(.f, ...) : argument &quot;.f&quot; is missing, with no default (which makes sense to me given that this line of code seems to be missing the argument of where it is drawing the geographical data from)</p>
  <p>Any tips on what to do? I don't understand why it would be returning a NULL result and I haven't been able to find much help online so far.</p>