1) I found the place with a map. OK. 2) I found the place by a map.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
1) I found the place with a map.
OK.
2) I found the place by a map.
No.
3) I found the place, using a map.
Comma not necessary, otherwise OK.
4) I found the place by using a map.
"by" not necessary.
Also: "I found the place with the aid of a map".