Welcome to Gear Talk with Annie and Brooke from Swimrun Labs.On this episode, we answer a question that we got from several of our listeners: what GPS Wearable should I get for swimrun? We discuss everything that should be considered in choosing a GPS watch and share our personal favorites. But first…Gear Updates/First ImpressionsAnnie ordered the  Aquasphere Classic Pullbuoy that was mentioned on the Budget Swimrun Kit episode for $6 and free shipping. Unfortunately, it wasn’t as giant as advertised. It’s the size of a regular swim pull buoy. That being said, for $6 you can buy two of them and glue them together.Ark Sports KORPBrooke has continued to have water infiltration issues with her Ark Sports KORP wetsuit. She contacted Ark and they mentioned that she should have sized down…but didn’t offer to replace it for the right size since she had already used it in open water. While the KORP might run big, Chris mentioned that his VIGG suit might run small. So make sure that you are super confident about your size.Ark Sports Keel+ Swimrun Pull Bouy Finally, Chris and Chipper have started testing with Ark Sports Keel+ Pull Buoy (this item is sold out online). Chipper did a “scientific” test of 100 yard swims with nothing, a regular pool pull buoy, a Keel, and the Keel+. The Keel+ was definitely the fastest. Chipper also used the Keel+ in a swimrun practice and was a lot faster in a full kit. Chris did a longer non-scientific test of 500s with paddles alternating between the Keel and the Keel+ and his gut told him that the Keel+ was faster. It took some getting used to swimming with the Keel+ given the size and extra buoyancy in a pool without a full kit on. We’ll have a full review on the Keel+ in a future show. In the meantime, you can listen to our complete review of the Keel Pull Buoy on Gear Talk.GPS Wearables for SwimrunBefore getting into the details about the best GPS wearables and watches for Swimrun, we wanted to make some global statements about GPS watches. First, having a GPS watch is not a necessity to participate in Swimrun or have fun out there so don’t let the lack of a GPS watch stop you from training and signing up for a race. Second, there are a lot of considerations about the technical features of the different watches. There is a better source for that type of analysis: DC Rainmaker is the gold standard for super in-depth reviews about specific watches. Finally, while most GPS watches have some form of heart rate monitoring and use different methods, either with a chest strap or wrist-based optical readers. Chest strap is the most accurate so if you’re looking for something for heart rate training and optical tracking is more for folks that aren’t totally devoted to zone training. Annie had some more thoughts on the matter that you can read below:Optical HR sensor accuracy can vary from individual to individual. Aspects such as skin color, hair density, and position can impact accuracy. The band should be snug.  It doesn’t need to leave marks, but you shouldn’t be able to slide a finger under the band (at least during workouts). Chest strap will always be more accurate than optical. If you do a lot of steady state training, using a wrist based HRM is generally pretty reliable because there’s not much HR variation it needs to pick up. Still can be 2-10 BPM off though, which is a lot.If your training is based on shorter intervals and you rely on HR to guide effort frequently, as in tightly zone-based training, opt for chest strap over optical HRM and save some bucks on your watch as you won’t need this feature. Wrist based HR can have a delay in presenting changes in HR, so if for example you are doing a 30 sec interval at higher intensity, you may be done with the interval before your watch picks up the effort increase.One last note- 24x7 HR monitoring (am resting HR, avg resting HR) can be helpful for gaining a lens into when you may be over-fatigued, having trouble recovering from your training, or respondi