I am a petite woman with small wrists. Will this watch be too big and/or uncomfortable on a 5 or 6 inch wrist?

I am also petite, 5 feet even and less than 100 pounds. While the watch is larger than a conventional one, I do not find it uncomfortable, and I have used it on runs as long as a marathon.

How well does this work with training on a treadmill when you have to been indoors and stationary?

I use the foot pod when running on the treadmill. You will get speed, distance and cadence information that is in the same format as when using the GPS. The foot pod will also give you cadence when are using the GPS outdoors.

I purchased Garmin Forerunner 310XT Waterproof Running GPS. I need to buy a Heart rate monitor that is compatible. Tell me wich please.

Garmin will tell you need the Garmin Premium Heart Rate Monitor (Soft Strap, ANT+ compatible). I am using the Garmin Heart-Rate Monitor (Regular Strap) I had from my deceased Forerunner 205 and it works fine. Some people complain the old monitor can hurt the side of the chest over the ribcage, so you might choose the new one. It seems to be a lot lighter too. The old one tends to slip when it is not tightly adjusted. Hope this helps.

what is a "non-standard" battery

Evidently it has a battery that you can only have replaced by them...my previous garmins had the same thing. I have heard that people can replace it with a battery from an IPOD, takes some soldering in either case. I have not done that. Batteries on all of my garmins have lasted for years.

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Garmin Forerunner 310XT GPS Multisport Watch - Grey

Product ID: 65362091

Details

Audio output mode
Monaural
Battery life
20 hours
Brand
Garmin
Connectivity technology
gps
Included components
Wrist strap
Map type
Satellite

📡High-sensitivity GPS receiver

⏱️20-hour battery life

🏊‍♂️Swim-proof durability

Description

🚀 Own your training journey with Garmin Forerunner 310XT — where precision meets endurance.

SEAMLESS SYNCING - Bluetooth connectivity effortlessly syncs your data to smartphones and computers—track progress without the hassle.
PRECISION NAVIGATION - High-sensitivity GPS with Hotfix satellite prediction locks your route fast, anywhere in the world.
CUSTOMIZABLE DATA VIEWS - Up to 4 different display screens let you tailor your metrics for every workout moment.
ENDURANCE THAT KEEPS UP - Up to 20 hours of uninterrupted GPS tracking—train longer, push harder.
TRIATHLON READY DURABILITY - Swim-proof design built for multisport athletes who demand versatility and resilience.

The Garmin Forerunner 310XT is a rugged, swim-proof multisport GPS watch designed for triathletes and dedicated athletes. Featuring a 20-hour battery life, high-sensitivity GPS with Hotfix satellite prediction, and Bluetooth connectivity, it offers precise tracking and seamless data syncing. Its customizable display and durable build make it an essential companion for serious fitness enthusiasts aiming to elevate their performance.

Specifications

ASIN	B0025VKW5K
Are Batteries Included?	Yes
Audio Output Mode	Monaural
Battery Average Life	20 hours
Box Contents	Wrist strap
Brand Name	Garmin
Compatible Devices	Smartphone Compatible GPS Devices
Compatible with Vehicle Type	Bicycle
Connectivity Protocol	GPS
Control Method	Touch
Customer Reviews	4.2 4.2 out of 5 stars (1,034)
Display Type	digital
Global Trade Identification Number	00753759086411
Human Interface Types	Buttons
Item Part Number	0100074100
Item Weight	72 Grams
Manufacturer	Garmin
Manufacturer Part Number	00-00741-00
Map Coverage Type	Satellite
Memory Storage Capacity	16 GB
Model Name	Forerunner 310XT
Model Number	010-00741-00
Model Year	2013
Mounting Type	Wrist Mount
Network Connectivity Technology	gps
Number of Items	1
Operating Systems	Windows XP, Mac OS 10.4
Product Features	compass & GPS^pulse monitor^lap timer^stop watch
Resolution	160 x 100 pixels
Screen Size	3.3 Inches
Software Update Supported to Date	unknown
Sport Type	Fitness
Supported Satellite Navigation System	GPS
Touch Screen Type	Resistive
UPC	069060231601 611105067333 753759086411 066510601557 837654710593
Unit Count	1.0 count

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