Ride in comfort aboard the largest charter boat at historic charter boat row!

Ultra Grand Slam Sport Fishing Charters and Captain Magnus Nilsson invite you down to Key West for an adventure of a lifetime. The company specializes in inshore, offshore, wrecks, and reef fishing trips that are great for seasoned enthusiasts and record-seekers alike.

Captain Magnus loves catching fish and having a great time on the water. The first mate will cater to your every need. We customize our trips to maximize your pleasure.

Whether you want to watch your friend reeling in the biggest catch in their life or you wish to test your angling skills and make a great catch possible, there is a trip for you. You will be able to enjoy the view, spot any action going on beneath the surface, and take in all the beauty of the surrounding waters from a flybridge.

Your day out will take you fishing for anything from Mutton Snapper and Kingfish to Black Grouper, Barracuda, Amberjack, Sharks, and Marlin. You will be trolling and live bait fishing for all big game species. Even if the weather doesn’t cooperate, Capt. Magnus and his crew will take you to the sheltered waters, where you will be able to try your hand at Jacks, Shark, and Barracuda.

The ‘Ultra Grand Slam’ is a Concord AMF Brunswick with 47’ of excellence. She has been uphauled in 2018 and comes powered by a pair of 450 HP Cummins engines. The Ultra Grand Slam is rigged with latest electronics, technologies, and professional accessories.

All trips come with the use of high-quality Penn International and Shimano tackle, as well as lures. Live bait will be caught on the trip.



Select date to see available trips and rates:

  • Private trip
    Half Day – Deep Sea Sportfishing
    FREE Cancellation 30 days notice
    4 Hour Trip, starts at 8:00 AM
    US $1,100
    Ride in comfort aboard the largest charter boat at historic charter boat row. This morning trip will take you fishing for various fish species not too far out from shore, including but not limited to Grouper and Snapper. The package comes inclusive with Penn International and Shimano gear.
  • Private trip
    3/4 Day – Deep Sea Sportfishing
    FREE Cancellation 30 days notice
    6 Hour Trip, starts at 8:00 AM
    US $1,300
    Ride in comfort aboard the largest charter boat at historic charter boat row. This 6-hour fishing trip is not only a great opportunity to add a few more hours to your time on the water. If you don't feel like fishing, you are welcome to spot porpoises, sea turtles, beds of seagrass, and take in all the beauty of the surrounding waters. And if you have the itch to fish, Amberjack, Barracuda, Shark, Mahi Mahi, and many other species are at your disposal.
  • Private trip
    Full Day – Deep Sea Sportfishing
    FREE Cancellation 30 days notice
    8 Hour Trip, starts at 8:00 AM
    US $1,500
    Ride in comfort aboard the largest charter boat at historic charter boat row. This full-day trip will take you up to 30 miles out for Sailfish, Black and White Marlin, Mahi Mahi, and many other species. You will be provided with Penn International and Shimano tackle to make a great catch possible.
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FAQs about Ultra Grand Slam Sport Fishing

Ultra Grand Slam Sport Fishing offers the following trips to customers:
  • US $1,100 per group - Half Day – Deep Sea Sportfishing (4 hours)
  • US $1,300 per group - 3/4 Day – Deep Sea Sportfishing (6 hours)
  • US $1,500 per group - Full Day – Deep Sea Sportfishing (8 hours)

When you book a trip with Ultra Grand Slam Sport Fishing, you can expect the following amenities onboard:
  • Toilet Full Size, Stand-up, Electric, lady-friendly
  • Air Conditioning
  • Fighting Chair
  • GPS
  • Fishfinder
  • Bed
  • Flybridge
  • Live Bait Well
  • Kitchen
  • Refrigerator
  • Multimedia System
  • Outriggers
  • Ice Box

Trips booked with Ultra Grand Slam Sport Fishing include:
  • Rods, reels & tackle
  • Live Bait (Caught during the trip)
  • Lures
  • Catch cleaning & filleting
  • First Mate
  • Fishing License

Ultra Grand Slam Sport Fishing offers the following types of fishing:
  • Inshore Fishing
  • Offshore Fishing (Up to 30 miles)
  • Reef Fishing
  • Wreck Fishing

Ultra Grand Slam Sport Fishing offers the following fishing techniques:
  • Light Tackle
  • Heavy Tackle
  • Bottom Fishing
  • Trolling
  • Spinning
  • Jigging
  • Deep Sea Fishing

Top targeted fish species with Ultra Grand Slam Sport Fishing include:
  • Amberjack
  • Barracuda (Great)
  • Dolphin (Mahi Mahi)
  • Grouper (Black)
  • King Mackerel (Kingfish)
  • Marlin (Blue)
  • Marlin (White)
  • Sailfish
  • Shark (Blacktip)
  • Shark (Hammerhead)
  • Shark (Tiger)
  • Snapper (Mutton)

Meet the Captain

Magnus Nilsson
Key West, Florida, United States
1 Fishing Report
ID & license verified
34 Customer reviews
Response time within an hour
Member since February 2018
Ride in comfort aboard the largest charter boat at historic charter boat row! Captain Magnus is born to fish and knows the Key West waters like the back of his hand. MEET THE CREW: Captain Magnus is the Owner/Operator of THE ULTRA GRAND SLAM FIVE (((5))) STAR SPORT FISHING CHARTERS! Known as "The Key West Fishing Viking" Capt. Magnus catches the Big Ones running out of the World Famous Charter Boat Row. THE ULTRA GRAND SLAM is a Fully Equipped, Deep Sea, Sports Fishing Cruiser and, is one of the few with Air Conditioning!!! His First Mate, Ross has been making it happen for over 20 years and has caught 3,600 Billfish to date!!! Together with Captain Magnus, they are the hardest working crew in Key West. Be there when they make it #3,601!!!

About this listing

Targeted species

Amberjack Amberjack
Barracuda (Great) Great Barracuda
Dolphin (Mahi Mahi) Dolphin (Mahi Mahi)
Grouper (Black) Black Grouper

Boat specs

Concord AMF Brunswick (Sportfishing) originally built in 1977, and restored in 2018. Powered by 2 450HP Cummins engines, with a maximum cruising speed of 22 knots.

Length
47 ft
Capacity
6 persons

Types of fishing

Inshore Fishing
Offshore Fishing
Up to 30 miles
Reef Fishing
Wreck Fishing

Fishing techniques

Light Tackle
Heavy Tackle
Bottom Fishing
Trolling
Spinning
Jigging
Deep Sea Fishing

Amenities

Toilet
Full Size, Stand-up, Electric, lady-friendly
Air Conditioning
Fighting Chair
GPS
Fishfinder
Bed

Trip includes

Rods, reels & tackle
Live Bait
Caught during the trip
Lures
Catch cleaning & filleting
First Mate
Fishing License

Cancellation policy

Free cancellation up to 30 days prior to trip

You can cancel or modify your booking up to 30 days before the trip date, free of charge. If you cancel or modify your booking later, or fail to show up, you'll forfeit 100% of what you've paid.

Listing policies

Pickup not included
Transfer to/from departure site is not included in trip rates.
Child Friendly
Infants allowed, no min age; life vests supplied
You Keep Catch
Catch and Release Allowed
Disabled Accessible

Payment

Book with 20% deposit, pay rest to captain

When the captain confirms your trip, FishingBooker charges your credit card a 20% deposit to guarantee your reservation.

The remaining balance is to be paid directly to the charter operator on or prior to your trip date in one of the following payment methods:

Cash
Visa
Mastercard
American Express
When paying the remaining balance with a credit card, an additional 3% charge will apply.

Key West Fishing Calendar

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Customer reviews

Rating summary
Excellent
4.6 / 5
out of 5 stars from 34 reviews
Boat
Excellent
4.4 / 5
Crew
Excellent
4.8 / 5
Experience
Excellent
4.7 / 5
Photos & videos by reviewers (30)
Better late than never!
Better late than never!
Better late than never!
+27
Angler rating
25
4
1
0
1
Anglers claimed
Good experience
92%
Friendly captain
100%
Recommend this charter
82%
Appropriate for children
100%
Satisfied with the boat
100%
Caught fish
78%
Sort by:
Featured  
Showing:
5 of 34 reviews
Tyler S.
Excellent
4.7 / 5
Experience:
Very good
4.0 / 5
Boat
Excellent
5.0 / 5
Crew
Excellent
5.0 / 5
Overall

Fishing with Magnus

VERIFIED   Full Day – Deep Sea Sportfishing on December 30, 2023
Tyler S. recommends Ultra Grand Slam Sport Fishing
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Tyler S. recommends Ultra Grand Slam Sport Fishing
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Kenneth R.
Excellent
4.7 / 5
Experience:
Very good
4.0 / 5
Boat
Excellent
5.0 / 5
Crew
Excellent
5.0 / 5
Overall

Better late than never!

VERIFIED   3/4 Day – Deep Sea Sportfishing on October 9, 2023
Took quite awhile but once we were on the fish we were all over them
Kenneth R. recommends Ultra Grand Slam Sport Fishing
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You found this review helpful
  Magnus Nilsson Captain replied

Michael M.
Boynton Beach, FL
Excellent
5.0 / 5
Experience:
Excellent
5.0 / 5
Boat
Excellent
5.0 / 5
Crew
Excellent
5.0 / 5
Overall

Full day trip

VERIFIED   Full Day – Deep Sea Sportfishing on August 10, 2022
We had a great time and caught a lot of Dolphin. The captain and first mate were awsome . If you want the best boat and crew...
Michael M. recommends Ultra Grand Slam Sport Fishing
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  Magnus Nilsson Captain replied

Jody B.
Zephyrhills, FL
Excellent
4.3 / 5
Experience:
Good
3.0 / 5
Boat
Excellent
5.0 / 5
Crew
Excellent
5.0 / 5
Overall

Capitan Magnus and Alan

VERIFIED   3/4 Day – Deep Sea Sportfishing on August 3, 2021
Both were fantastic!! The fish weren’t biting, but that’s not their fault. The air conditioner didn’t work, but we survived....
Jody B. recommends Ultra Grand Slam Sport Fishing
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Jody B. recommends Ultra Grand Slam Sport Fishing
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You found this review helpful

Rodney J.
Oshkosh, WI
Excellent
5.0 / 5
Experience:
Excellent
5.0 / 5
Boat
Excellent
5.0 / 5
Crew
Excellent
5.0 / 5
Overall

Great crew

VERIFIED   3/4 Day – Deep Sea Sportfishing on January 15, 2023
Awesome time
Rodney J. recommends Ultra Grand Slam Sport Fishing
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  Magnus Nilsson Captain replied