? fish finder tranducer best mounted in side the boat or out side

[great white whaler]

inside i cant see it giving a true reading of water temperture..........

[Rick.]

Outside for sure unless you have a very good reason for an inside mount. Inside won't give water temp. or I should say accurate water temp. Rick.

[mszomola]

If you have a fiberglass boat and you think its pretty then through hull , other wise external is fine .