GPS livestock trackers: a sceptical look at whether a small place needs one

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Research. Nothing here wears a tracker, and we are not convinced anything should. What follows is what collars and tags trade against each other, why the battery figure and the update figure cannot both be true, and the coverage test to run first. If we buy one, this page gets updated with the date — and the tag above it changes only after a season of carrying it, if it changes at all.

On a small place with pasture you can see from the house, a tracker is nearly the last thing to buy.

What this actually solves

Three problems justify a tracker: stock on ground you cannot see; theft; and herds too large to eyeball. On 35 acres of open pasture behind sound fence, none of those is the problem.

The problem is the fence. Money goes to the charger and ground rods first, then a tester, then the latch. A tracker tells you an animal is out. A working fence means it is not.

Where one earns its keep on a small place is narrower: a single repeat escapee. Cattle move as a group, so one unit on the animal that leads them out gives nearly all the information for one subscription. No vendor volunteers that.

Collar against ear tag

Collar. Room for a real battery, so more frequent fixes and longer life, and it moves between animals in a minute. The electronics ride on top of the neck for sky view, with a counterweight below holding them there. A collar is also a loop, and a loop catches — loose enough to be comfortable is loose enough to hang on a feeder rail. On goats in brush, not theoretical.

Ear tag. Nothing to catch, nothing to slip over a head. The battery is the size of the tag, so you get infrequent fixes or a short life, and a heavy tag tears an ear over a season. Sky view is good with the head up, poor with it down grazing — most of the day.

Battery life against update rate

This is the whole trade, hidden in plain sight. "Up to 12 months" and "updates every 5 minutes" sit on the same page and are not the same mode. A GPS fix plus a transmission is the entire power budget.

Rough shape: hourly fixes might give most of a year, fifteen-minute fixes a season, live tracking a few days. Most devices sit slow and speed up on a geofence breach, which is right — but the headline number is the slow mode, and the mode you want is the expensive one.

The part printed nowhere: a failed fix costs more power than a successful one. Under canopy the receiver keeps trying, so wooded ground drains the battery faster and returns worse positions. That is the exact ground you bought it for.

Ask whether the cell is user-replaceable. A sealed unit at end of life is a repeat purchase, not a repair.

Coverage at the property is the constraint

Cellular trackers work where the carrier works, which is a property question, not a product question. Bars at the house mean nothing about the back corner. Walk the lowest ground with a phone on the tracker's carrier, leaf-on, and check that data moves — not that a call connects. If it will not load a page standing there, it will not report from an animal lying down there.

LoRa with your own base station trades the carrier problem for a terrain problem plus a device needing power and internet. Satellite works anywhere, costs more, and updates slowly.

Do the subscription arithmetic, because it ends most of these decisions. Figure $100 to $300 for the device and $5 to $15 a month per animal, billed per device. Ten head is ten subscriptions — on the order of a thousand dollars a year, every year, which is a great deal of fence.

What it will not do

It will not contain anything. A geofence alert says the herd left; it does not stop them, and on an hourly interval that alert can be an hour stale while cattle keep walking.

Virtual fencing — collars that turn stock with sound and a correction — is a different product class: per head, plus a base station, plus a subscription, priced for outfits running hundreds of animals. It does not scale down to 35 acres honestly.

And it does not replace putting eyes on stock. You are looking for lameness, gut fill, and the one standing off on its own. A collar reports none of that — see low-stress handling.

What we are buying

This may be the page that never turns into a purchase. The decision it leaves open is whether one is worth owning at all: a single unit on the animal that leads the others out is the only version whose arithmetic works here, and that is not a question worth answering before the fence is finished. If we do buy, the device, collar or tag, what it cost, and the coverage result at the bottom corner measured rather than guessed go here with the date, along with the monthly figure per animal once some bills have run. The tag at the top says Research either way. A purchase is not what would move it, and on this page it may never move at all.

Before you buy

• Fix the fence first. Charger, ground, latch. A tracker reports the failure it cannot prevent.
• Test data coverage at the worst corner of the property, in leaf, before buying anything.
• One unit on the animal that leads them out beats one on every head. Price it per animal.

— Chris D., McEwen, Tennessee