You'll need two.  The hot spots elite for Banks, Clear lake, Shasta  & the Potholes and the Navioncs West for Lk WA, Samamish, the Columbia River and the California Delta.

I looked at Lowrance web site and the Elite chip is $99.00 but did not see Lake Washington or the Columbia River...might still get it though as it has the western states and lots of other Washington lakes.

I just recently talked to an Ex-Rep for Lowrance who now works at Outdoor Emporium. I was looking for the same thing. He showed me the differences inbetween the 2, the Hot spots shows some fishing related symbols, but that is it, the mapping nearly isnt as good.

The Navionics map has Great mapping on pretty much everything with more detail, for lake WA it is better than hot spots.

He proved this by asking me where some shallow humps I know of and try and find them on certain lakes, Hot spots most of them said they were 20-30 feet, on Navionics they are extrememly close reality with 3-8 feet.

ADVANTAGE: Navionics

Hey Nick where are your favorite log jams at in lake Washington?

You keep thinking that Mr. Barr.