Rough Diagram
Rough Map
noun
An abbreviation version of a diagram doesn't include all the details. It's more like a rough diagram that shows only the essentials.
While 略図 can be used for any simplified diagram, it most commonly refers to a rough map that gives a basic overview of an area.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
あなたの家からうちまでの略図をかいて、メールでお送りします
I'll draw a rough map from your house to mine and email it to you.
あなたが作った略図をちょっと見せてもらえませんか？
Could you show me the rough diagram you made?
略図だけでは不安なので、念のためGPSも使います。
I feel uneasy with just the rough map, so I'll use GPS as well, just in case.