Simple. Blow it. Look at Nessie. Use your camera.
I think you can buy a good Nessie whistle at the tourist shop- that's what I used. It's like a dog whistle so people can't hear it- but it drives old Nessie wild!
you get a whistle get in the boat go as far as you can whistle the take a picture of nessie
you take the rowboat left twice into the river. blow the pennywhistle. remember to use the camera.
You get the pennywhistle from the bartender after your third victory in darts at the Pub, on your second visit to Loch Ness. You can use the rowboat by yourself after telling off the boat owner. Go left twice in the boat to reach the lagoon where Nessie is hiding. She will pop up when you blow the whistle. (You can actually get out and climb on Nessie when taking the photo!)
You don't. The actual Nessie photo is the THIRD photo you take at Loch Ness. On your first visit there, you get the camera and matches, and a rowboat ticket from the dart game at the Pub. But the photo you show to Mews is just truck tires, and a shadowy Nessie in the background. On your second visit, you get a submarine ticket, but the photo you get is of a movie prop. After showing this at the Pub, you get the Pennywhistle that lets you call the real Nessie on your solo trip in the rowboat. Go left twice in the rowboat to reach the lagoon and use the whistle.
The Loch Ness Monster isn't in the submarine. You have to drive the submarine to the bottom right corner and a creature that appears to be Nessie is there. Take a picture of the creature. Take it to the men at the pub and they tell you that was a prop used in a movie that sank. To find Nessie, you beat the red-headed man at the pub three times in a game of darts. Accusing you of cheating, he storms out of the pub. The bar tender gives you a fair prize, a penny whistle. You go on the boat and go farther into the lake. Play the whistle and Nessie rises out of the water. Take a picture and show it to Mews.
On the submarine tour, dive to the bottom and you can photograph a colorful "Nessie" head. But when you take it back to the Pub, it turns out to be a picture of a movie prop. Beat the first dart player again to get a pennywhistle from the bartender. Take the rowboat out again (alone) and use the whistle to lure Nessie. (see the related question below)
You get the pennywhistle after you play the first dart player again at Loch Ness. After you visit Loch Ness the first time, and take the rowboat, return the photo to the Mews mansion. It is not convincing. On your second trip to Loch Ness, you can win a submarine ticket by playing darts as you did the first time. Dive to the bottom of the Loch to get a Nessie photo, and return it to the pub. The first dart player shows up, but is a poor loser when you beat him. The bartender gives you the pennywhistle. Take the rowboat out alone, go left twice, and blow the whistle to summon Nessie.
wolf whistle
you have to mate a female Nessie and a male Nessie from the expeditions, it will give you a black Nessie or a blue Nessie
You go to the Pub again and show the two guys the photo you took in the sub then they will say its a fake so then you will go to the door and play darts against the man who you beat the first time he wont give you the whistle but the waiter will.